Merge pull request #7 from searxng/metrics

Metrics

46 files changed, 1393 insertions, 381 deletions

diff --git a/searx/engines/__init__.py b/searx/engines/__init__.py
index 95eda6dde..6c3ac7a42 100644
--- a/searx/engines/__init__.py
+++ b/searx/engines/__init__.py
@@ -21,7 +21,6 @@ import threading
 from os.path import realpath, dirname
 from babel.localedata import locale_identifiers
 from urllib.parse import urlparse
-from flask_babel import gettext
 from operator import itemgetter
 from searx import settings
 from searx import logger
@@ -51,8 +50,6 @@ engine_default_args = {'paging': False,
                        'shortcut': '-',
                        'disabled': False,
                        'enable_http': False,
-                       'suspend_end_time': 0,
-                       'continuous_errors': 0,
                        'time_range_support': False,
                        'engine_type': 'online',
                        'display_error_messages': True,
@@ -138,22 +135,6 @@ def load_engine(engine_data):
         setattr(engine, 'fetch_supported_languages',
                 lambda: engine._fetch_supported_languages(get(engine.supported_languages_url, headers=headers)))
 
-    engine.stats = {
-        'sent_search_count': 0,  # sent search
-        'search_count': 0,  # succesful search
-        'result_count': 0,
-        'engine_time': 0,
-        'engine_time_count': 0,
-        'score_count': 0,
-        'errors': 0
-    }
-
-    engine_type = getattr(engine, 'engine_type', 'online')
-
-    if engine_type != 'offline':
-        engine.stats['page_load_time'] = 0
-        engine.stats['page_load_count'] = 0
-
     # tor related settings
     if settings['outgoing'].get('using_tor_proxy'):
         # use onion url if using tor.
@@ -177,103 +158,6 @@ def load_engine(engine_data):
     return engine
 
 
-def to_percentage(stats, maxvalue):
-    for engine_stat in stats:
-        if maxvalue:
-            engine_stat['percentage'] = int(engine_stat['avg'] / maxvalue * 100)
-        else:
-            engine_stat['percentage'] = 0
-    return stats
-
-
-def get_engines_stats(preferences):
-    # TODO refactor
-    pageloads = []
-    engine_times = []
-    results = []
-    scores = []
-    errors = []
-    scores_per_result = []
-
-    max_pageload = max_engine_times = max_results = max_score = max_errors = max_score_per_result = 0  # noqa
-    for engine in engines.values():
-        if not preferences.validate_token(engine):
-            continue
-
-        if engine.stats['search_count'] == 0:
-            continue
-
-        results_num = \
-            engine.stats['result_count'] / float(engine.stats['search_count'])
-
-        if engine.stats['engine_time_count'] != 0:
-            this_engine_time = engine.stats['engine_time'] / float(engine.stats['engine_time_count'])  # noqa
-        else:
-            this_engine_time = 0
-
-        if results_num:
-            score = engine.stats['score_count'] / float(engine.stats['search_count'])  # noqa
-            score_per_result = score / results_num
-        else:
-            score = score_per_result = 0.0
-
-        if engine.engine_type != 'offline':
-            load_times = 0
-            if engine.stats['page_load_count'] != 0:
-                load_times = engine.stats['page_load_time'] / float(engine.stats['page_load_count'])  # noqa
-            max_pageload = max(load_times, max_pageload)
-            pageloads.append({'avg': load_times, 'name': engine.name})
-
-        max_engine_times = max(this_engine_time, max_engine_times)
-        max_results = max(results_num, max_results)
-        max_score = max(score, max_score)
-        max_score_per_result = max(score_per_result, max_score_per_result)
-        max_errors = max(max_errors, engine.stats['errors'])
-
-        engine_times.append({'avg': this_engine_time, 'name': engine.name})
-        results.append({'avg': results_num, 'name': engine.name})
-        scores.append({'avg': score, 'name': engine.name})
-        errors.append({'avg': engine.stats['errors'], 'name': engine.name})
-        scores_per_result.append({
-            'avg': score_per_result,
-            'name': engine.name
-        })
-
-    pageloads = to_percentage(pageloads, max_pageload)
-    engine_times = to_percentage(engine_times, max_engine_times)
-    results = to_percentage(results, max_results)
-    scores = to_percentage(scores, max_score)
-    scores_per_result = to_percentage(scores_per_result, max_score_per_result)
-    errors = to_percentage(errors, max_errors)
-
-    return [
-        (
-            gettext('Engine time (sec)'),
-            sorted(engine_times, key=itemgetter('avg'))
-        ),
-        (
-            gettext('Page loads (sec)'),
-            sorted(pageloads, key=itemgetter('avg'))
-        ),
-        (
-            gettext('Number of results'),
-            sorted(results, key=itemgetter('avg'), reverse=True)
-        ),
-        (
-            gettext('Scores'),
-            sorted(scores, key=itemgetter('avg'), reverse=True)
-        ),
-        (
-            gettext('Scores per result'),
-            sorted(scores_per_result, key=itemgetter('avg'), reverse=True)
-        ),
-        (
-            gettext('Errors'),
-            sorted(errors, key=itemgetter('avg'), reverse=True)
-        ),
-    ]
-
-
 def load_engines(engine_list):
     global engines, engine_shortcuts
     engines.clear()
diff --git a/searx/metrics/__init__.py b/searx/metrics/__init__.py
new file mode 100644
index 000000000..bae62c915
--- /dev/null
+++ b/searx/metrics/__init__.py
@@ -0,0 +1,206 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+import typing
+import math
+import contextlib
+from timeit import default_timer
+from operator import itemgetter
+
+from searx.engines import engines
+from .models import HistogramStorage, CounterStorage
+from .error_recorder import count_error, count_exception, errors_per_engines
+
+__all__ = ["initialize",
+           "get_engines_stats", "get_engine_errors",
+           "histogram", "histogram_observe", "histogram_observe_time",
+           "counter", "counter_inc", "counter_add",
+           "count_error", "count_exception"]
+
+
+ENDPOINTS = {'search'}
+
+
+histogram_storage: typing.Optional[HistogramStorage] = None
+counter_storage: typing.Optional[CounterStorage] = None
+
+
+@contextlib.contextmanager
+def histogram_observe_time(*args):
+    h = histogram_storage.get(*args)
+    before = default_timer()
+    yield before
+    duration = default_timer() - before
+    if h:
+        h.observe(duration)
+    else:
+        raise ValueError("histogram " + repr((*args,)) + " doesn't not exist")
+
+
+def histogram_observe(duration, *args):
+    histogram_storage.get(*args).observe(duration)
+
+
+def histogram(*args, raise_on_not_found=True):
+    h = histogram_storage.get(*args)
+    if raise_on_not_found and h is None:
+        raise ValueError("histogram " + repr((*args,)) + " doesn't not exist")
+    return h
+
+
+def counter_inc(*args):
+    counter_storage.add(1, *args)
+
+
+def counter_add(value, *args):
+    counter_storage.add(value, *args)
+
+
+def counter(*args):
+    return counter_storage.get(*args)
+
+
+def initialize(engine_names=None):
+    """
+    Initialize metrics
+    """
+    global counter_storage, histogram_storage
+
+    counter_storage = CounterStorage()
+    histogram_storage = HistogramStorage()
+
+    # max_timeout = max of all the engine.timeout
+    max_timeout = 2
+    for engine_name in (engine_names or engines):
+        if engine_name in engines:
+            max_timeout = max(max_timeout, engines[engine_name].timeout)
+
+    # histogram configuration
+    histogram_width = 0.1
+    histogram_size = int(1.5 * max_timeout / histogram_width)
+
+    # engines
+    for engine_name in (engine_names or engines):
+        # search count
+        counter_storage.configure('engine', engine_name, 'search', 'count', 'sent')
+        counter_storage.configure('engine', engine_name, 'search', 'count', 'successful')
+        # global counter of errors
+        counter_storage.configure('engine', engine_name, 'search', 'count', 'error')
+        # score of the engine
+        counter_storage.configure('engine', engine_name, 'score')
+        # result count per requests
+        histogram_storage.configure(1, 100, 'engine', engine_name, 'result', 'count')
+        # time doing HTTP requests
+        histogram_storage.configure(histogram_width, histogram_size, 'engine', engine_name, 'time', 'http')
+        # total time
+        # .time.request and ...response times may overlap .time.http time.
+        histogram_storage.configure(histogram_width, histogram_size, 'engine', engine_name, 'time', 'total')
+
+
+def get_engine_errors(engline_list):
+    result = {}
+    engine_names = list(errors_per_engines.keys())
+    engine_names.sort()
+    for engine_name in engine_names:
+        if engine_name not in engline_list:
+            continue
+
+        error_stats = errors_per_engines[engine_name]
+        sent_search_count = max(counter('engine', engine_name, 'search', 'count', 'sent'), 1)
+        sorted_context_count_list = sorted(error_stats.items(), key=lambda context_count: context_count[1])
+        r = []
+        for context, count in sorted_context_count_list:
+            percentage = round(20 * count / sent_search_count) * 5
+            r.append({
+                'filename': context.filename,
+                'function': context.function,
+                'line_no': context.line_no,
+                'code': context.code,
+                'exception_classname': context.exception_classname,
+                'log_message': context.log_message,
+                'log_parameters': context.log_parameters,
+                'secondary': context.secondary,
+                'percentage': percentage,
+            })
+        result[engine_name] = sorted(r, reverse=True, key=lambda d: d['percentage'])
+    return result
+
+
+def to_percentage(stats, maxvalue):
+    for engine_stat in stats:
+        if maxvalue:
+            engine_stat['percentage'] = int(engine_stat['avg'] / maxvalue * 100)
+        else:
+            engine_stat['percentage'] = 0
+    return stats
+
+
+def get_engines_stats(engine_list):
+    global counter_storage, histogram_storage
+
+    assert counter_storage is not None
+    assert histogram_storage is not None
+
+    list_time = []
+    list_time_http = []
+    list_time_total = []
+    list_result_count = []
+    list_error_count = []
+    list_scores = []
+    list_scores_per_result = []
+
+    max_error_count = max_http_time = max_time_total = max_result_count = max_score = None  # noqa
+    for engine_name in engine_list:
+        error_count = counter('engine', engine_name, 'search', 'count', 'error')
+
+        if counter('engine', engine_name, 'search', 'count', 'sent') > 0:
+            list_error_count.append({'avg': error_count, 'name': engine_name})
+            max_error_count = max(error_count, max_error_count or 0)
+
+        successful_count = counter('engine', engine_name, 'search', 'count', 'successful')
+        if successful_count == 0:
+            continue
+
+        result_count_sum = histogram('engine', engine_name, 'result', 'count').sum
+        time_total = histogram('engine', engine_name, 'time', 'total').percentage(50)
+        time_http = histogram('engine', engine_name, 'time', 'http').percentage(50)
+        result_count = result_count_sum / float(successful_count)
+
+        if result_count:
+            score = counter('engine', engine_name, 'score')  # noqa
+            score_per_result = score / float(result_count_sum)
+        else:
+            score = score_per_result = 0.0
+
+        max_time_total = max(time_total, max_time_total or 0)
+        max_http_time = max(time_http, max_http_time or 0)
+        max_result_count = max(result_count, max_result_count or 0)
+        max_score = max(score, max_score or 0)
+
+        list_time.append({'total': round(time_total, 1),
+                          'http': round(time_http, 1),
+                          'name': engine_name,
+                          'processing': round(time_total - time_http, 1)})
+        list_time_total.append({'avg': time_total, 'name': engine_name})
+        list_time_http.append({'avg': time_http, 'name': engine_name})
+        list_result_count.append({'avg': result_count, 'name': engine_name})
+        list_scores.append({'avg': score, 'name': engine_name})
+        list_scores_per_result.append({'avg': score_per_result, 'name': engine_name})
+
+    list_time = sorted(list_time, key=itemgetter('total'))
+    list_time_total = sorted(to_percentage(list_time_total, max_time_total), key=itemgetter('avg'))
+    list_time_http = sorted(to_percentage(list_time_http, max_http_time), key=itemgetter('avg'))
+    list_result_count = sorted(to_percentage(list_result_count, max_result_count), key=itemgetter('avg'), reverse=True)
+    list_scores = sorted(list_scores, key=itemgetter('avg'), reverse=True)
+    list_scores_per_result = sorted(list_scores_per_result, key=itemgetter('avg'), reverse=True)
+    list_error_count = sorted(to_percentage(list_error_count, max_error_count), key=itemgetter('avg'), reverse=True)
+
+    return {
+        'time': list_time,
+        'max_time': math.ceil(max_time_total or 0),
+        'time_total': list_time_total,
+        'time_http': list_time_http,
+        'result_count': list_result_count,
+        'scores': list_scores,
+        'scores_per_result': list_scores_per_result,
+        'error_count': list_error_count,
+    }
diff --git a/searx/metrology/error_recorder.py b/searx/metrics/error_recorder.py
index 167d1c8aa..2bf25fb0d 100644
--- a/searx/metrology/error_recorder.py
+++ b/searx/metrics/error_recorder.py
@@ -1,6 +1,5 @@
 import typing
 import inspect
-import logging
 from json import JSONDecodeError
 from urllib.parse import urlparse
 from httpx import HTTPError, HTTPStatusError
@@ -9,16 +8,15 @@ from searx.exceptions import (SearxXPathSyntaxException, SearxEngineXPathExcepti
 from searx import logger
 
 
-logging.basicConfig(level=logging.INFO)
-
 errors_per_engines = {}
 
 
 class ErrorContext:
 
-    __slots__ = 'filename', 'function', 'line_no', 'code', 'exception_classname', 'log_message', 'log_parameters'
+    __slots__ = ('filename', 'function', 'line_no', 'code', 'exception_classname',
+                 'log_message', 'log_parameters', 'secondary')
 
-    def __init__(self, filename, function, line_no, code, exception_classname, log_message, log_parameters):
+    def __init__(self, filename, function, line_no, code, exception_classname, log_message, log_parameters, secondary):
         self.filename = filename
         self.function = function
         self.line_no = line_no
@@ -26,22 +24,24 @@ class ErrorContext:
         self.exception_classname = exception_classname
         self.log_message = log_message
         self.log_parameters = log_parameters
+        self.secondary = secondary
 
     def __eq__(self, o) -> bool:
         if not isinstance(o, ErrorContext):
             return False
         return self.filename == o.filename and self.function == o.function and self.line_no == o.line_no\
             and self.code == o.code and self.exception_classname == o.exception_classname\
-            and self.log_message == o.log_message and self.log_parameters == o.log_parameters
+            and self.log_message == o.log_message and self.log_parameters == o.log_parameters \
+            and self.secondary == o.secondary
 
     def __hash__(self):
         return hash((self.filename, self.function, self.line_no, self.code, self.exception_classname, self.log_message,
-                     self.log_parameters))
+                     self.log_parameters, self.secondary))
 
     def __repr__(self):
-        return "ErrorContext({!r}, {!r}, {!r}, {!r}, {!r}, {!r})".\
+        return "ErrorContext({!r}, {!r}, {!r}, {!r}, {!r}, {!r}) {!r}".\
             format(self.filename, self.line_no, self.code, self.exception_classname, self.log_message,
-                   self.log_parameters)
+                   self.log_parameters, self.secondary)
 
 
 def add_error_context(engine_name: str, error_context: ErrorContext) -> None:
@@ -114,31 +114,32 @@ def get_exception_classname(exc: Exception) -> str:
     return exc_module + '.' + exc_name
 
 
-def get_error_context(framerecords, exception_classname, log_message, log_parameters) -> ErrorContext:
+def get_error_context(framerecords, exception_classname, log_message, log_parameters, secondary) -> ErrorContext:
     searx_frame = get_trace(framerecords)
     filename = searx_frame.filename
     function = searx_frame.function
     line_no = searx_frame.lineno
     code = searx_frame.code_context[0].strip()
     del framerecords
-    return ErrorContext(filename, function, line_no, code, exception_classname, log_message, log_parameters)
+    return ErrorContext(filename, function, line_no, code, exception_classname, log_message, log_parameters, secondary)
 
 
-def record_exception(engine_name: str, exc: Exception) -> None:
+def count_exception(engine_name: str, exc: Exception, secondary: bool = False) -> None:
     framerecords = inspect.trace()
     try:
         exception_classname = get_exception_classname(exc)
         log_parameters = get_messages(exc, framerecords[-1][1])
-        error_context = get_error_context(framerecords, exception_classname, None, log_parameters)
+        error_context = get_error_context(framerecords, exception_classname, None, log_parameters, secondary)
         add_error_context(engine_name, error_context)
     finally:
         del framerecords
 
 
-def record_error(engine_name: str, log_message: str, log_parameters: typing.Optional[typing.Tuple] = None) -> None:
+def count_error(engine_name: str, log_message: str, log_parameters: typing.Optional[typing.Tuple] = None,
+                secondary: bool = False) -> None:
     framerecords = list(reversed(inspect.stack()[1:]))
     try:
-        error_context = get_error_context(framerecords, None, log_message, log_parameters or ())
+        error_context = get_error_context(framerecords, None, log_message, log_parameters or (), secondary)
         add_error_context(engine_name, error_context)
     finally:
         del framerecords
diff --git a/searx/metrics/models.py b/searx/metrics/models.py
new file mode 100644
index 000000000..8936a51e3
--- /dev/null
+++ b/searx/metrics/models.py
@@ -0,0 +1,156 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+import decimal
+import threading
+
+from searx import logger
+
+
+__all__ = ["Histogram", "HistogramStorage", "CounterStorage"]
+
+logger = logger.getChild('searx.metrics')
+
+
+class Histogram:
+
+    _slots__ = '_lock', '_size', '_sum', '_quartiles', '_count', '_width'
+
+    def __init__(self, width=10, size=200):
+        self._lock = threading.Lock()
+        self._width = width
+        self._size = size
+        self._quartiles = [0] * size
+        self._count = 0
+        self._sum = 0
+
+    def observe(self, value):
+        q = int(value / self._width)
+        if q < 0:
+            """Value below zero is ignored"""
+            q = 0
+        if q >= self._size:
+            """Value above the maximum is replaced by the maximum"""
+            q = self._size - 1
+        with self._lock:
+            self._quartiles[q] += 1
+            self._count += 1
+            self._sum += value
+
+    @property
+    def quartiles(self):
+        return list(self._quartiles)
+
+    @property
+    def count(self):
+        return self._count
+
+    @property
+    def sum(self):
+        return self._sum
+
+    @property
+    def average(self):
+        with self._lock:
+            if self._count != 0:
+                return self._sum / self._count
+            else:
+                return 0
+
+    @property
+    def quartile_percentage(self):
+        ''' Quartile in percentage '''
+        with self._lock:
+            if self._count > 0:
+                return [int(q * 100 / self._count) for q in self._quartiles]
+            else:
+                return self._quartiles
+
+    @property
+    def quartile_percentage_map(self):
+        result = {}
+        # use Decimal to avoid rounding errors
+        x = decimal.Decimal(0)
+        width = decimal.Decimal(self._width)
+        width_exponent = -width.as_tuple().exponent
+        with self._lock:
+            if self._count > 0:
+                for y in self._quartiles:
+                    yp = int(y * 100 / self._count)
+                    if yp != 0:
+                        result[round(float(x), width_exponent)] = yp
+                    x += width
+        return result
+
+    def percentage(self, percentage):
+        # use Decimal to avoid rounding errors
+        x = decimal.Decimal(0)
+        width = decimal.Decimal(self._width)
+        stop_at_value = decimal.Decimal(self._count) / 100 * percentage
+        sum_value = 0
+        with self._lock:
+            if self._count > 0:
+                for y in self._quartiles:
+                    sum_value += y
+                    if sum_value >= stop_at_value:
+                        return x
+                    x += width
+        return None
+
+    def __repr__(self):
+        return "Histogram<avg: " + str(self.average) + ", count: " + str(self._count) + ">"
+
+
+class HistogramStorage:
+
+    __slots__ = 'measures'
+
+    def __init__(self):
+        self.clear()
+
+    def clear(self):
+        self.measures = {}
+
+    def configure(self, width, size, *args):
+        measure = Histogram(width, size)
+        self.measures[args] = measure
+        return measure
+
+    def get(self, *args):
+        return self.measures.get(args, None)
+
+    def dump(self):
+        logger.debug("Histograms:")
+        ks = sorted(self.measures.keys(), key='/'.join)
+        for k in ks:
+            logger.debug("- %-60s %s", '|'.join(k), self.measures[k])
+
+
+class CounterStorage:
+
+    __slots__ = 'counters', 'lock'
+
+    def __init__(self):
+        self.lock = threading.Lock()
+        self.clear()
+
+    def clear(self):
+        with self.lock:
+            self.counters = {}
+
+    def configure(self, *args):
+        with self.lock:
+            self.counters[args] = 0
+
+    def get(self, *args):
+        return self.counters[args]
+
+    def add(self, value, *args):
+        with self.lock:
+            self.counters[args] += value
+
+    def dump(self):
+        with self.lock:
+            ks = sorted(self.counters.keys(), key='/'.join)
+        logger.debug("Counters:")
+        for k in ks:
+            logger.debug("- %-60s %s", '|'.join(k), self.counters[k])
diff --git a/searx/metrology/__init__.py b/searx/metrology/__init__.py
deleted file mode 100644
index e69de29bb..000000000
--- a/searx/metrology/__init__.py
+++ /dev/null
diff --git a/searx/network/__init__.py b/searx/network/__init__.py
index dbd31c781..40665f7d6 100644
--- a/searx/network/__init__.py
+++ b/searx/network/__init__.py
@@ -3,7 +3,7 @@
 import asyncio
 import threading
 import concurrent.futures
-from time import time
+from timeit import default_timer
 
 import httpx
 import h2.exceptions
@@ -65,7 +65,7 @@ def get_context_network():
 
 def request(method, url, **kwargs):
     """same as requests/requests/api.py request(...)"""
-    time_before_request = time()
+    time_before_request = default_timer()
 
     # timeout (httpx)
     if 'timeout' in kwargs:
@@ -82,7 +82,7 @@ def request(method, url, **kwargs):
     timeout += 0.2  # overhead
     start_time = getattr(THREADLOCAL, 'start_time', time_before_request)
     if start_time:
-        timeout -= time() - start_time
+        timeout -= default_timer() - start_time
 
     # raise_for_error
     check_for_httperror = True
@@ -111,7 +111,7 @@ def request(method, url, **kwargs):
     # update total_time.
     # See get_time_for_thread() and reset_time_for_thread()
     if hasattr(THREADLOCAL, 'total_time'):
-        time_after_request = time()
+        time_after_request = default_timer()
         THREADLOCAL.total_time += time_after_request - time_before_request
 
     # raise an exception
diff --git a/searx/network/network.py b/searx/network/network.py
index f50acf595..15c23d193 100644
--- a/searx/network/network.py
+++ b/searx/network/network.py
@@ -199,7 +199,7 @@ class Network:
 
 def get_network(name=None):
     global NETWORKS
-    return NETWORKS[name or DEFAULT_NAME]
+    return NETWORKS.get(name or DEFAULT_NAME)
 
 
 def initialize(settings_engines=None, settings_outgoing=None):
diff --git a/searx/raise_for_httperror/__init__.py b/searx/raise_for_httperror/__init__.py
new file mode 100644
index 000000000..b133da507
--- /dev/null
+++ b/searx/raise_for_httperror/__init__.py
@@ -0,0 +1,2 @@
+# compatibility with searx/searx
+from searx.network import raise_for_httperror
diff --git a/searx/results.py b/searx/results.py
index b3b874118..a1c1d8527 100644
--- a/searx/results.py
+++ b/searx/results.py
@@ -5,7 +5,7 @@ from threading import RLock
 from urllib.parse import urlparse, unquote
 from searx import logger
 from searx.engines import engines
-from searx.metrology.error_recorder import record_error
+from searx.metrics import histogram_observe, counter_add, count_error
 
 
 CONTENT_LEN_IGNORED_CHARS_REGEX = re.compile(r'[,;:!?\./\\\\ ()-_]', re.M | re.U)
@@ -196,12 +196,10 @@ class ResultContainer:
 
         if len(error_msgs) > 0:
             for msg in error_msgs:
-                record_error(engine_name, 'some results are invalids: ' + msg)
+                count_error(engine_name, 'some results are invalids: ' + msg, secondary=True)
 
         if engine_name in engines:
-            with RLock():
-                engines[engine_name].stats['search_count'] += 1
-                engines[engine_name].stats['result_count'] += standard_result_count
+            histogram_observe(standard_result_count, 'engine', engine_name, 'result', 'count')
 
         if not self.paging and standard_result_count > 0 and engine_name in engines\
            and engines[engine_name].paging:
@@ -301,9 +299,8 @@ class ResultContainer:
         for result in self._merged_results:
             score = result_score(result)
             result['score'] = score
-            with RLock():
-                for result_engine in result['engines']:
-                    engines[result_engine].stats['score_count'] += score
+            for result_engine in result['engines']:
+                counter_add(score, 'engine', result_engine, 'score')
 
         results = sorted(self._merged_results, key=itemgetter('score'), reverse=True)
 
@@ -369,9 +366,9 @@ class ResultContainer:
             return 0
         return resultnum_sum / len(self._number_of_results)
 
-    def add_unresponsive_engine(self, engine_name, error_type, error_message=None):
+    def add_unresponsive_engine(self, engine_name, error_type, error_message=None, suspended=False):
         if engines[engine_name].display_error_messages:
-            self.unresponsive_engines.add((engine_name, error_type, error_message))
+            self.unresponsive_engines.add((engine_name, error_type, error_message, suspended))
 
     def add_timing(self, engine_name, engine_time, page_load_time):
         self.timings.append({
diff --git a/searx/search/__init__.py b/searx/search/__init__.py
index f777e8595..9b26f38de 100644
--- a/searx/search/__init__.py
+++ b/searx/search/__init__.py
@@ -18,7 +18,7 @@ along with searx. If not, see < http://www.gnu.org/licenses/ >.
 import typing
 import gc
 import threading
-from time import time
+from timeit import default_timer
 from uuid import uuid4
 from _thread import start_new_thread
 
@@ -31,6 +31,7 @@ from searx.plugins import plugins
 from searx.search.models import EngineRef, SearchQuery
 from searx.search.processors import processors, initialize as initialize_processors
 from searx.search.checker import initialize as initialize_checker
+from searx.metrics import initialize as initialize_metrics, counter_inc, histogram_observe_time
 
 
 logger = logger.getChild('search')
@@ -50,6 +51,7 @@ else:
 def initialize(settings_engines=None, enable_checker=False):
     settings_engines = settings_engines or settings['engines']
     initialize_processors(settings_engines)
+    initialize_metrics([engine['name'] for engine in settings_engines])
     if enable_checker:
         initialize_checker()
 
@@ -106,13 +108,16 @@ class Search:
         for engineref in self.search_query.engineref_list:
             processor = processors[engineref.name]
 
+            # stop the request now if the engine is suspend
+            if processor.extend_container_if_suspended(self.result_container):
+                continue
+
             # set default request parameters
             request_params = processor.get_params(self.search_query, engineref.category)
             if request_params is None:
                 continue
 
-            with threading.RLock():
-                processor.engine.stats['sent_search_count'] += 1
+            counter_inc('engine', engineref.name, 'search', 'count', 'sent')
 
             # append request to list
             requests.append((engineref.name, self.search_query.query, request_params))
@@ -157,7 +162,7 @@ class Search:
 
         for th in threading.enumerate():
             if th.name == search_id:
-                remaining_time = max(0.0, self.actual_timeout - (time() - self.start_time))
+                remaining_time = max(0.0, self.actual_timeout - (default_timer() - self.start_time))
                 th.join(remaining_time)
                 if th.is_alive():
                     th._timeout = True
@@ -180,12 +185,10 @@ class Search:
 
     # do search-request
     def search(self):
-        self.start_time = time()
-
+        self.start_time = default_timer()
         if not self.search_external_bang():
             if not self.search_answerers():
                 self.search_standard()
-
         return self.result_container
 
 
diff --git a/searx/search/checker/impl.py b/searx/search/checker/impl.py
index e54b3f68d..dd090c513 100644
--- a/searx/search/checker/impl.py
+++ b/searx/search/checker/impl.py
@@ -4,8 +4,8 @@ import typing
 import types
 import functools
 import itertools
-import threading
 from time import time
+from timeit import default_timer
 from urllib.parse import urlparse
 
 import re
@@ -17,6 +17,7 @@ from searx import network, logger
 from searx.results import ResultContainer
 from searx.search.models import SearchQuery, EngineRef
 from searx.search.processors import EngineProcessor
+from searx.metrics import counter_inc
 
 
 logger = logger.getChild('searx.search.checker')
@@ -385,9 +386,8 @@ class Checker:
         engineref_category = search_query.engineref_list[0].category
         params = self.processor.get_params(search_query, engineref_category)
         if params is not None:
-            with threading.RLock():
-                self.processor.engine.stats['sent_search_count'] += 1
-            self.processor.search(search_query.query, params, result_container, time(), 5)
+            counter_inc('engine', search_query.engineref_list[0].name, 'search', 'count', 'sent')
+            self.processor.search(search_query.query, params, result_container, default_timer(), 5)
         return result_container
 
     def get_result_container_tests(self, test_name: str, search_query: SearchQuery) -> ResultContainerTests:
diff --git a/searx/search/processors/abstract.py b/searx/search/processors/abstract.py
index 26dab069f..854f6df6a 100644
--- a/searx/search/processors/abstract.py
+++ b/searx/search/processors/abstract.py
@@ -1,17 +1,110 @@
 # SPDX-License-Identifier: AGPL-3.0-or-later
 
+import threading
 from abc import abstractmethod, ABC
+from timeit import default_timer
+
 from searx import logger
+from searx.engines import settings
+from searx.network import get_time_for_thread, get_network
+from searx.metrics import histogram_observe, counter_inc, count_exception, count_error
+from searx.exceptions import SearxEngineAccessDeniedException
 
 
 logger = logger.getChild('searx.search.processor')
+SUSPENDED_STATUS = {}
+
+
+class SuspendedStatus:
+
+    __slots__ = 'suspend_end_time', 'suspend_reason', 'continuous_errors', 'lock'
+
+    def __init__(self):
+        self.lock = threading.Lock()
+        self.continuous_errors = 0
+        self.suspend_end_time = 0
+        self.suspend_reason = None
+
+    @property
+    def is_suspended(self):
+        return self.suspend_end_time >= default_timer()
+
+    def suspend(self, suspended_time, suspend_reason):
+        with self.lock:
+            # update continuous_errors / suspend_end_time
+            self.continuous_errors += 1
+            if suspended_time is None:
+                suspended_time = min(settings['search']['max_ban_time_on_fail'],
+                                     self.continuous_errors * settings['search']['ban_time_on_fail'])
+            self.suspend_end_time = default_timer() + suspended_time
+            self.suspend_reason = suspend_reason
+        logger.debug('Suspend engine for %i seconds', suspended_time)
+
+    def resume(self):
+        with self.lock:
+            # reset the suspend variables
+            self.continuous_errors = 0
+            self.suspend_end_time = 0
+            self.suspend_reason = None
 
 
 class EngineProcessor(ABC):
 
+    __slots__ = 'engine', 'engine_name', 'lock', 'suspended_status'
+
     def __init__(self, engine, engine_name):
         self.engine = engine
         self.engine_name = engine_name
+        key = get_network(self.engine_name)
+        key = id(key) if key else self.engine_name
+        self.suspended_status = SUSPENDED_STATUS.setdefault(key, SuspendedStatus())
+
+    def handle_exception(self, result_container, reason, exception, suspend=False, display_exception=True):
+        # update result_container
+        error_message = str(exception) if display_exception and exception else None
+        result_container.add_unresponsive_engine(self.engine_name, reason, error_message)
+        # metrics
+        counter_inc('engine', self.engine_name, 'search', 'count', 'error')
+        if exception:
+            count_exception(self.engine_name, exception)
+        else:
+            count_error(self.engine_name, reason)
+        # suspend the engine ?
+        if suspend:
+            suspended_time = None
+            if isinstance(exception, SearxEngineAccessDeniedException):
+                suspended_time = exception.suspended_time
+            self.suspended_status.suspend(suspended_time, reason)  # pylint: disable=no-member
+
+    def _extend_container_basic(self, result_container, start_time, search_results):
+        # update result_container
+        result_container.extend(self.engine_name, search_results)
+        engine_time = default_timer() - start_time
+        page_load_time = get_time_for_thread()
+        result_container.add_timing(self.engine_name, engine_time, page_load_time)
+        # metrics
+        counter_inc('engine', self.engine_name, 'search', 'count', 'successful')
+        histogram_observe(engine_time, 'engine', self.engine_name, 'time', 'total')
+        if page_load_time is not None:
+            histogram_observe(page_load_time, 'engine', self.engine_name, 'time', 'http')
+
+    def extend_container(self, result_container, start_time, search_results):
+        if getattr(threading.current_thread(), '_timeout', False):
+            # the main thread is not waiting anymore
+            self.handle_exception(result_container, 'Timeout', None)
+        else:
+            # check if the engine accepted the request
+            if search_results is not None:
+                self._extend_container_basic(result_container, start_time, search_results)
+            self.suspended_status.resume()
+
+    def extend_container_if_suspended(self, result_container):
+        if self.suspended_status.is_suspended:
+            result_container.add_unresponsive_engine(self.engine_name,
+                                                     self.suspended_status.suspend_reason,
+                                                     suspended=True)
+            return True
+        return False
 
     def get_params(self, search_query, engine_category):
         # if paging is not supported, skip
diff --git a/searx/search/processors/offline.py b/searx/search/processors/offline.py
index ede8eb5e1..5186b346a 100644
--- a/searx/search/processors/offline.py
+++ b/searx/search/processors/offline.py
@@ -1,51 +1,26 @@
 # SPDX-License-Identifier: AGPL-3.0-or-later
 
-import threading
-from time import time
 from searx import logger
-from searx.metrology.error_recorder import record_exception, record_error
 from searx.search.processors.abstract import EngineProcessor
 
 
-logger = logger.getChild('search.processor.offline')
+logger = logger.getChild('searx.search.processor.offline')
 
 
 class OfflineProcessor(EngineProcessor):
 
     engine_type = 'offline'
 
-    def _record_stats_on_error(self, result_container, start_time):
-        engine_time = time() - start_time
-        result_container.add_timing(self.engine_name, engine_time, engine_time)
-
-        with threading.RLock():
-            self.engine.stats['errors'] += 1
-
     def _search_basic(self, query, params):
         return self.engine.search(query, params)
 
     def search(self, query, params, result_container, start_time, timeout_limit):
         try:
             search_results = self._search_basic(query, params)
-
-            if search_results:
-                result_container.extend(self.engine_name, search_results)
-
-                engine_time = time() - start_time
-                result_container.add_timing(self.engine_name, engine_time, engine_time)
-                with threading.RLock():
-                    self.engine.stats['engine_time'] += engine_time
-                    self.engine.stats['engine_time_count'] += 1
-
+            self.extend_container(result_container, start_time, search_results)
         except ValueError as e:
-            record_exception(self.engine_name, e)
-            self._record_stats_on_error(result_container, start_time)
+            # do not record the error
             logger.exception('engine {0} : invalid input : {1}'.format(self.engine_name, e))
         except Exception as e:
-            record_exception(self.engine_name, e)
-            self._record_stats_on_error(result_container, start_time)
-            result_container.add_unresponsive_engine(self.engine_name, 'unexpected crash', str(e))
+            self.handle_exception(result_container, 'unexpected crash', e)
             logger.exception('engine {0} : exception : {1}'.format(self.engine_name, e))
-        else:
-            if getattr(threading.current_thread(), '_timeout', False):
-                record_error(self.engine_name, 'Timeout')
diff --git a/searx/search/processors/online.py b/searx/search/processors/online.py
index 66719ea9b..c39937023 100644
--- a/searx/search/processors/online.py
+++ b/searx/search/processors/online.py
@@ -1,23 +1,21 @@
 # SPDX-License-Identifier: AGPL-3.0-or-later
 
 from time import time
-import threading
 import asyncio
 
 import httpx
 
 import searx.network
-from searx.engines import settings
 from searx import logger
 from searx.utils import gen_useragent
 from searx.exceptions import (SearxEngineAccessDeniedException, SearxEngineCaptchaException,
                               SearxEngineTooManyRequestsException,)
-from searx.metrology.error_recorder import record_exception, record_error
+from searx.metrics.error_recorder import count_error
 
 from searx.search.processors.abstract import EngineProcessor
 
 
-logger = logger.getChild('search.processor.online')
+logger = logger.getChild('searx.search.processor.online')
 
 
 def default_request_params():
@@ -41,11 +39,6 @@ class OnlineProcessor(EngineProcessor):
         if params is None:
             return None
 
-        # skip suspended engines
-        if self.engine.suspend_end_time >= time():
-            logger.debug('Engine currently suspended: %s', self.engine_name)
-            return None
-
         # add default params
         params.update(default_request_params())
 
@@ -97,9 +90,10 @@ class OnlineProcessor(EngineProcessor):
             status_code = str(response.status_code or '')
             reason = response.reason_phrase or ''
             hostname = response.url.host
-            record_error(self.engine_name,
-                         '{} redirects, maximum: {}'.format(len(response.history), soft_max_redirects),
-                         (status_code, reason, hostname))
+            count_error(self.engine_name,
+                        '{} redirects, maximum: {}'.format(len(response.history), soft_max_redirects),
+                        (status_code, reason, hostname),
+                        secondary=True)
 
         return response
 
@@ -130,89 +124,38 @@ class OnlineProcessor(EngineProcessor):
         # set the network
         searx.network.set_context_network_name(self.engine_name)
 
-        # suppose everything will be alright
-        http_exception = False
-        suspended_time = None
-
         try:
             # send requests and parse the results
             search_results = self._search_basic(query, params)
-
-            # check if the engine accepted the request
-            if search_results is not None:
-                # yes, so add results
-                result_container.extend(self.engine_name, search_results)
-
-                # update engine time when there is no exception
-                engine_time = time() - start_time
-                page_load_time = searx.network.get_time_for_thread()
-                result_container.add_timing(self.engine_name, engine_time, page_load_time)
-                with threading.RLock():
-                    self.engine.stats['engine_time'] += engine_time
-                    self.engine.stats['engine_time_count'] += 1
-                    # update stats with the total HTTP time
-                    self.engine.stats['page_load_time'] += page_load_time
-                    self.engine.stats['page_load_count'] += 1
-        except Exception as e:
-            record_exception(self.engine_name, e)
-
-            # Timing
-            engine_time = time() - start_time
-            page_load_time = searx.network.get_time_for_thread()
-            result_container.add_timing(self.engine_name, engine_time, page_load_time)
-
-            # Record the errors
-            with threading.RLock():
-                self.engine.stats['errors'] += 1
-
-            if (issubclass(e.__class__, (httpx.TimeoutException, asyncio.TimeoutError))):
-                result_container.add_unresponsive_engine(self.engine_name, 'HTTP timeout')
-                # requests timeout (connect or read)
-                logger.error("engine {0} : HTTP requests timeout"
+            self.extend_container(result_container, start_time, search_results)
+        except (httpx.TimeoutException, asyncio.TimeoutError) as e:
+            # requests timeout (connect or read)
+            self.handle_exception(result_container, 'HTTP timeout', e, suspend=True, display_exception=False)
+            logger.error("engine {0} : HTTP requests timeout"
+                         "(search duration : {1} s, timeout: {2} s) : {3}"
+                         .format(self.engine_name, time() - start_time,
+                                 timeout_limit,
+                                 e.__class__.__name__))
+        except (httpx.HTTPError, httpx.StreamError) as e:
+            # other requests exception
+            self.handle_exception(result_container, 'HTTP error', e, suspend=True, display_exception=False)
+            logger.exception("engine {0} : requests exception"
                              "(search duration : {1} s, timeout: {2} s) : {3}"
-                             .format(self.engine_name, engine_time, timeout_limit, e.__class__.__name__))
-                http_exception = True
-            elif (issubclass(e.__class__, (httpx.HTTPError, httpx.StreamError))):
-                result_container.add_unresponsive_engine(self.engine_name, 'HTTP error')
-                # other requests exception
-                logger.exception("engine {0} : requests exception"
-                                 "(search duration : {1} s, timeout: {2} s) : {3}"
-                                 .format(self.engine_name, engine_time, timeout_limit, e))
-                http_exception = True
-            elif (issubclass(e.__class__, SearxEngineCaptchaException)):
-                result_container.add_unresponsive_engine(self.engine_name, 'CAPTCHA required')
-                logger.exception('engine {0} : CAPTCHA'.format(self.engine_name))
-                suspended_time = e.suspended_time  # pylint: disable=no-member
-            elif (issubclass(e.__class__, SearxEngineTooManyRequestsException)):
-                result_container.add_unresponsive_engine(self.engine_name, 'too many requests')
-                logger.exception('engine {0} : Too many requests'.format(self.engine_name))
-                suspended_time = e.suspended_time  # pylint: disable=no-member
-            elif (issubclass(e.__class__, SearxEngineAccessDeniedException)):
-                result_container.add_unresponsive_engine(self.engine_name, 'blocked')
-                logger.exception('engine {0} : Searx is blocked'.format(self.engine_name))
-                suspended_time = e.suspended_time  # pylint: disable=no-member
-            else:
-                result_container.add_unresponsive_engine(self.engine_name, 'unexpected crash')
-                # others errors
-                logger.exception('engine {0} : exception : {1}'.format(self.engine_name, e))
-        else:
-            if getattr(threading.current_thread(), '_timeout', False):
-                record_error(self.engine_name, 'Timeout')
-
-        # suspend the engine if there is an HTTP error
-        # or suspended_time is defined
-        with threading.RLock():
-            if http_exception or suspended_time:
-                # update continuous_errors / suspend_end_time
-                self.engine.continuous_errors += 1
-                if suspended_time is None:
-                    suspended_time = min(settings['search']['max_ban_time_on_fail'],
-                                         self.engine.continuous_errors * settings['search']['ban_time_on_fail'])
-                self.engine.suspend_end_time = time() + suspended_time
-            else:
-                # reset the suspend variables
-                self.engine.continuous_errors = 0
-                self.engine.suspend_end_time = 0
+                             .format(self.engine_name, time() - start_time,
+                                     timeout_limit,
+                                     e))
+        except SearxEngineCaptchaException as e:
+            self.handle_exception(result_container, 'CAPTCHA required', e, suspend=True, display_exception=False)
+            logger.exception('engine {0} : CAPTCHA'.format(self.engine_name))
+        except SearxEngineTooManyRequestsException as e:
+            self.handle_exception(result_container, 'too many requests', e, suspend=True, display_exception=False)
+            logger.exception('engine {0} : Too many requests'.format(self.engine_name))
+        except SearxEngineAccessDeniedException as e:
+            self.handle_exception(result_container, 'blocked', e, suspend=True, display_exception=False)
+            logger.exception('engine {0} : Searx is blocked'.format(self.engine_name))
+        except Exception as e:
+            self.handle_exception(result_container, 'unexpected crash', e, display_exception=False)
+            logger.exception('engine {0} : exception : {1}'.format(self.engine_name, e))
 
     def get_default_tests(self):
         tests = {}
diff --git a/searx/static/themes/oscar/css/logicodev-dark.css b/searx/static/themes/oscar/css/logicodev-dark.css
index 9bacb3c13..618de9327 100644
--- a/searx/static/themes/oscar/css/logicodev-dark.css
+++ b/searx/static/themes/oscar/css/logicodev-dark.css
@@ -923,12 +923,78 @@ input.cursor-text {
   padding: 0.5rem 1rem;
   margin: 0rem 0 0 2rem;
   border: 1px solid #ddd;
+  box-shadow: 2px 2px 2px 0px rgba(0, 0, 0, 0.1);
   background: white;
   font-size: 14px;
   font-weight: normal;
   z-index: 1000000;
 }
+td:hover .engine-tooltip,
 th:hover .engine-tooltip,
 .engine-tooltip:hover {
   display: inline-block;
 }
+/* stacked-bar-chart */
+.stacked-bar-chart {
+  margin: 0;
+  padding: 0 0.125rem 0 3rem;
+  width: 100%;
+  width: -moz-available;
+  width: -webkit-fill-available;
+  width: fill;
+  flex-direction: row;
+  flex-wrap: nowrap;
+  flex-grow: 1;
+  align-items: center;
+  display: inline-flex;
+}
+.stacked-bar-chart-value {
+  width: 3rem;
+  display: inline-block;
+  position: absolute;
+  padding: 0 0.5rem;
+  text-align: right;
+}
+.stacked-bar-chart-base {
+  display: flex;
+  flex-shrink: 0;
+  flex-grow: 0;
+  flex-basis: unset;
+}
+.stacked-bar-chart-median {
+  display: flex;
+  flex-shrink: 0;
+  flex-grow: 0;
+  flex-basis: unset;
+  background: #000000;
+  border: 1px solid rgba(0, 0, 0, 0.9);
+  padding: 0.3rem 0;
+}
+.stacked-bar-chart-rate80 {
+  display: flex;
+  flex-shrink: 0;
+  flex-grow: 0;
+  flex-basis: unset;
+  background: transparent;
+  border: 1px solid rgba(0, 0, 0, 0.3);
+  padding: 0.3rem 0;
+}
+.stacked-bar-chart-rate95 {
+  display: flex;
+  flex-shrink: 0;
+  flex-grow: 0;
+  flex-basis: unset;
+  background: transparent;
+  border-bottom: 1px dotted rgba(0, 0, 0, 0.5);
+  padding: 0;
+}
+.stacked-bar-chart-rate100 {
+  display: flex;
+  flex-shrink: 0;
+  flex-grow: 0;
+  flex-basis: unset;
+  background: transparent;
+  border-left: 1px solid rgba(0, 0, 0, 0.9);
+  padding: 0.4rem 0;
+  width: 1px;
+}
diff --git a/searx/static/themes/oscar/css/logicodev-dark.min.css b/searx/static/themes/oscar/css/logicodev-dark.min.css
index a70a109f4..09aed0298 100644
--- a/searx/static/themes/oscar/css/logicodev-dark.min.css
+++ b/searx/static/themes/oscar/css/logicodev-dark.min.css
@@ -1 +1 @@
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diff --git a/searx/static/themes/oscar/css/logicodev-dark.min.css.map b/searx/static/themes/oscar/css/logicodev-dark.min.css.map
index 4cd2eb8c5..71062db2e 100644
--- a/searx/static/themes/oscar/css/logicodev-dark.min.css.map
+++ b/searx/static/themes/oscar/css/logicodev-dark.min.css.map
@@ -1 +1 @@
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\ No newline at end of file
+{"version":3,"sources":["../src/less/logicodev/footer.less","../src/less/logicodev/checkbox.less","../src/less/logicodev/onoff.less","../src/less/logicodev/results.less","../src/less/logicodev/infobox.less","../src/less/logicodev/search.less","../src/less/logicodev/advanced.less","../src/less/logicodev/cursor.less","../src/less/logicodev/code.less","../src/less/logicodev/pygments.less","../src/less/logicodev/preferences.less","../src/less/logicodev-dark/oscar.less"],"names":[],"mappings":"AACA,EACE,cAAA,YAEF,KACE,SAAA,SACA,WAAA,KACA,MAAA,QAGF,KAEE,YAAA,OAAA,UAAA,MAAA,WACA,cAAA,KACA,iBAAA,KAEA,OACI,MAAA,KAIN,QACE,SAAA,SACA,OAAA,EACA,MAAA,KAEA,OAAA,KACA,WAAA,OACA,MAAA,KC3B2B,oDAAoF,+EAC/G,QAAA,KAI2H,qFAA1F,8DACjC,QAAA,KCPF,gBACI,MAAA,IAEJ,aACI,SAAA,SACA,MAAA,MACA,oBAAA,KACA,iBAAA,KACA,gBAAA,KAEJ,sBACI,QAAA,EACA,SAAA,SAEiB,6BACjB,QAAA,GACA,QAAA,aACA,MAAA,KACA,OAAA,KACA,aAAA,KACA,SAAA,SACA,KAAA,EACA,OAAA,IACA,iBAAA,KACA,OAAA,IAAA,MAAA,KACA,cAAA,EAEJ,mBACI,QAAA,MACA,SAAA,OACA,OAAA,QACA,OAAA,IAAA,MAAA,eACA,cAAA,eAEJ,mBACI,QAAA,MACA,WAAA,OAAA,IAAA,QAAA,GAGyC,yBAA3B,0BACd,QAAA,MACA,MAAA,KACA,MAAA,IACA,OAAA,KACA,QAAA,EACA,YAAA,KACA,UAAA,KACA,WAAA,WACA,QAAA,GACA,iBAAA,KAGJ,oBACI,QAAA,MACA,MAAA,KACA,iBAAA,QACA,SAAA,SACA,IAAA,EACA,OAAA,EACA,MAAA,EACA,OAAA,IAAA,MAAA,KACA,cAAA,eACA,WAAA,IAAA,IAAA,QAAA,GAE+C,oEAC/C,aAAA,EAE+C,qEAC/C,MAAA,KACA,iBAAA,QAE6C,mEAC7C,OAAA,IAAA,MAAA,KCxEJ,eACI,WAAA,EACA,cAAA,IACA,UAAA,KAEA,wBACI,cAAA,KAGJ,iBACI,MAAA,QACA,gBAAA,KAEC,uBACG,MAAA,KAGH,yBACG,MAAA,QAGJ,4BACI,iBAAA,QAOZ,gBAAiB,eAAgB,eAC7B,WAAA,IACA,cAAA,EACA,UAAA,WACA,MAAA,KACA,UAAA,KAGI,mBACJ,YAAA,IAGJ,eACI,UAAA,KACA,MAAA,KAGJ,eACI,UAAA,KACA,MAAA,MAGJ,iBACI,WAAA,KACA,cAAA,KAGJ,eACI,MAAA,QACA,UAAA,KACA,cAAA,KAEA,iBACI,aAAA,IAKS,aAAjB,gBAAgE,YAAjC,gBAAiB,eAC5C,MAAA,KACA,QAAA,KAAA,IACC,mBAAA,sBAAA,kBAAA,sBAAA,qBACG,iBAAA,QAMR,eACI,MAAA,eACA,OAAA,EACA,QAAA,EACA,iBACI,QAAA,MACA,MAAA,KACA,gBAAA,MACA,gCACI,OAAA,eACA,QAAA,EAEM,uBAAT,uBACG,QAAA,EACA,sCAAA,sCACI,WAAA,IAAA,IAAA,KAAA,EAAA,KAMI,mCAChB,WAAA,QACA,WAAA,QAGc,wBACd,MAAA,IACA,QAAA,IAAA,KAAA,KAAA,IAEI,yCACI,OAAA,EACA,WAAA,MACA,WAAA,MAKZ,eACI,OAAA,IACA,WAAA,MACA,WAAA,MAIJ,eACI,MAAA,KAEA,kBACI,OAAA,IAAA,EAAA,KAAA,EAGJ,yBACI,MAAA,KAGJ,mBACI,cAAA,IAKR,gBACI,MAAA,KAEA,kBACI,aAAA,IACA,YAAA,IAGJ,yBACI,MAAA,QAGJ,0BACI,MAAA,QAIR,iBACI,MAAA,KACA,OAAA,IAEA,oBACI,cAAA,IACA,MAAA,QAGF,kCACE,MAAA,KAKR,YACI,MAAA,KAIJ,aACI,MAAA,KAEA,wBAAuB,0BACnB,MAAA,KAMR,iBACI,OAAA,IAAA,IACA,UAAA,KAEA,sBACI,UAAA,KACA,YAAA,OACA,UAAA,WACA,WAAA,KAKR,iBACI,aAAA,IAIJ,YACI,WAAA,KACA,eAAA,KAGJ,eACI,MAAA,KACA,WAAA,IAGgB,0BAChB,UAAA,WAGJ,eACI,WAAA,EAAA,IAAA,KAAA,eAGJ,eACI,gBAAA,YACA,iBAAA,KACA,OAAA,IAAA,MAAA,eACA,cAAA,IACA,WAAA,EAAA,IAAA,IAAA,eACA,QAAA,EAAA,KACA,SAAA,SAGgC,mCAChC,eACI,WAAA,OCxOJ,wBACI,iBAAA,QAEA,qCACI,YAAA,IAIR,qBACI,YAAA,OACA,SAAA,OACA,cAAA,SACA,QAAA,MAIJ,WACI,YAA+C,eAAlC,QAAA,QAAb,kBAA+C,MAA/C,gBACA,WAAA,OAGJ,aACI,WAAA,QAGJ,cACI,iBAAA,QACA,OAAA,KAEA,gBACI,MAAA,KACA,OAAA,IAIR,uBACI,cAAA,KACA,UAAA,WACA,aAAA,MAIS,kCACT,cAAA,EAGJ,yBACI,MAAA,KACA,WAAA,OACA,cAAA,EACA,OAAA,QAGW,+BACX,WAAA,KAIc,yCACd,WAAA,MACA,SAAA,OAEsB,iDACtB,WAAA,KAIgC,+DAChC,QAAA,MAEgC,6DAChC,QAAA,KAIwC,qEACxC,QAAA,MAEwC,uEACxC,QAAA,KAIiC,0DACjC,QAAA,KAEyC,kEACzC,QAAA,MCzFY,YAApB,mBACE,eAAA,WACA,cAAA,MACA,QAAA,KACA,UAAA,KACA,UAAA,IAAA,KACA,cAAA,QAEO,+BAAP,kBAAO,sCAAP,yBACE,UAAA,EACA,WAAA,KACA,UAAA,OACA,YAAA,IACA,iBAAA,KACA,OAAA,KAAA,IAAA,MACA,aAAA,KACA,MAAA,KACA,eAAA,MACA,YAAA,MACA,WAAA,OACA,UAAA,KAEkC,0CAA/B,6BAA+B,iDAA/B,oCACD,aAAA,KAAA,IAAA,MAG2B,+CAAA,sDAC7B,MAAA,QACA,YAAA,IACA,cAAA,QAAA,IAAA,MAIJ,WACI,WAAA,KACA,cAAA,KAGO,eACP,UAAA,MACA,MAAA,IAGJ,GACI,WAAA,KACA,aAAA,KACA,aAAA,KAG2B,mCAC3B,aAAA,KAG+B,yCAC9B,iBAAA,QACA,MAAA,KAGL,eAAgB,mBACZ,WAAA,KACA,mBAAA,KACA,gBAAA,KACA,UAAA,OACA,YAAA,IACA,iBAAA,KACA,OAAA,KAAA,IAAA,MACA,MAAA,KAEA,WAAA,okBAAA,IAAA,UAGJ,mBACI,sBAAA,GAGJ,eACI,cAAA,KAGJ,iBACI,SAAA,mBACA,OAAA,IACA,MAAA,IACA,SAAA,OACA,KAAM,sBACN,YAAA,OAEW,YAAf,cACI,WAAA,QAEY,aAAhB,eACI,WAAA,QAEE,oBACF,aAAA,eC9FJ,2BACI,QAAA,KACA,WAAA,KACA,cAAA,KACA,MAAA,KAEO,8CAAP,iCACI,UAAA,OACA,YAAA,IACA,iBAAA,KACA,OAAA,KAAA,IAAA,MACA,aAAA,KACA,MAAA,KACA,eAAA,MACA,cAAA,MACA,aAAA,MAGgC,yDAA/B,4CACD,aAAA,KAAA,IAAA,MAGC,6CACD,QAAA,KAGwB,2DACxB,MAAA,QACA,YAAA,IACA,cAAA,QAAA,IAAA,MAIc,4BAClB,gBAAA,UAGoB,mDACpB,QAAA,MAGJ,UACI,QAAA,EACA,WAAA,MACA,WAAA,MACA,gBAAO,iBACH,OAAA,QC7CR,aACI,OAAA,eAGJ,gBACI,OAAA,kBCNC,KAAL,IACI,YAA2C,cAAA,cAA3C,iBAAA,oBCIY,yBACZ,sBAAA,KACA,oBAAA,KACA,mBAAA,KACA,iBAAA,KACA,gBAAA,KACA,YAAA,KACA,OAAA,QASA,aAAA,IACA,WAAA,MARC,oCACG,WAAA,IAEH,yCACG,WAAA,IAOQ,oBAAM,YAAA,KACK,mCAAU,MAAA,QAAgB,iBAAA,YAA+B,aAAA,IAAmB,cAAA,IACnF,6BAAW,MAAA,QAAgB,iBAAA,YAA+B,aAAA,IAAmB,cAAA,IACtE,oCAAW,MAAA,KAAgB,iBAAA,QAA2B,aAAA,IAAmB,cAAA,IACxE,qCAAW,MAAA,KAAgB,iBAAA,QAA2B,aAAA,IAAmB,cAAA,IACrF,qBAAO,iBAAA,KACvB,gBAAkB,WAAA,QACF,mBAAK,MAAA,QAAgB,WAAA,OACrB,qBAAO,OAAA,IAAA,MAAA,IACP,mBAAK,MAAA,QAAgB,YAAA,IACrB,mBAAK,MAAA,QACL,oBAAM,MAAA,QAAgB,WAAA,OACtB,oBAAM,MAAA,QAAgB,WAAA,OACtB,oBAAM,MAAA,QAAgB,WAAA,OACtB,qBAAO,MAAA,QAAgB,WAAA,OACvB,oBAAM,MAAA,QAAgB,WAAA,OACtB,oBAAM,M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\ No newline at end of file
diff --git a/searx/static/themes/oscar/css/logicodev.css b/searx/static/themes/oscar/css/logicodev.css
index 6e5bddce3..4f6b36b11 100644
--- a/searx/static/themes/oscar/css/logicodev.css
+++ b/searx/static/themes/oscar/css/logicodev.css
@@ -896,15 +896,81 @@ input.cursor-text {
   padding: 0.5rem 1rem;
   margin: 0rem 0 0 2rem;
   border: 1px solid #ddd;
+  box-shadow: 2px 2px 2px 0px rgba(0, 0, 0, 0.1);
   background: white;
   font-size: 14px;
   font-weight: normal;
   z-index: 1000000;
 }
+td:hover .engine-tooltip,
 th:hover .engine-tooltip,
 .engine-tooltip:hover {
   display: inline-block;
 }
+/* stacked-bar-chart */
+.stacked-bar-chart {
+  margin: 0;
+  padding: 0 0.125rem 0 3rem;
+  width: 100%;
+  width: -moz-available;
+  width: -webkit-fill-available;
+  width: fill;
+  flex-direction: row;
+  flex-wrap: nowrap;
+  flex-grow: 1;
+  align-items: center;
+  display: inline-flex;
+}
+.stacked-bar-chart-value {
+  width: 3rem;
+  display: inline-block;
+  position: absolute;
+  padding: 0 0.5rem;
+  text-align: right;
+}
+.stacked-bar-chart-base {
+  display: flex;
+  flex-shrink: 0;
+  flex-grow: 0;
+  flex-basis: unset;
+}
+.stacked-bar-chart-median {
+  display: flex;
+  flex-shrink: 0;
+  flex-grow: 0;
+  flex-basis: unset;
+  background: #d5d8d7;
+  border: 1px solid rgba(213, 216, 215, 0.9);
+  padding: 0.3rem 0;
+}
+.stacked-bar-chart-rate80 {
+  display: flex;
+  flex-shrink: 0;
+  flex-grow: 0;
+  flex-basis: unset;
+  background: transparent;
+  border: 1px solid rgba(213, 216, 215, 0.3);
+  padding: 0.3rem 0;
+}
+.stacked-bar-chart-rate95 {
+  display: flex;
+  flex-shrink: 0;
+  flex-grow: 0;
+  flex-basis: unset;
+  background: transparent;
+  border-bottom: 1px dotted rgba(213, 216, 215, 0.5);
+  padding: 0;
+}
+.stacked-bar-chart-rate100 {
+  display: flex;
+  flex-shrink: 0;
+  flex-grow: 0;
+  flex-basis: unset;
+  background: transparent;
+  border-left: 1px solid rgba(213, 216, 215, 0.9);
+  padding: 0.4rem 0;
+  width: 1px;
+}
 /*Global*/
 body {
   background: #1d1f21 none !important;
diff --git a/searx/static/themes/oscar/css/logicodev.min.css b/searx/static/themes/oscar/css/logicodev.min.css
index 12ddfe00e..db035aa75 100644
--- a/searx/static/themes/oscar/css/logicodev.min.css
+++ b/searx/static/themes/oscar/css/logicodev.min.css
@@ -1 +1 @@
-.searx-navbar{background:#29314D;height:2.3rem;font-size:1.3rem;line-height:1.3rem;padding:.5rem;font-weight:700;margin-bottom:.8rem}.searx-navbar a,.searx-navbar a:hover{margin-right:2rem;color:#fff;text-decoration:none}.searx-navbar .instance a{color:#01D7D4;margin-left:2rem}#main-logo{margin-top:20vh;margin-bottom:25px}#main-logo>img{max-width:350px;width:80%}*{border-radius:0!important}html{position:relative;min-height:100%;color:#29314D}body{font-family:Roboto,Helvetica,Arial,sans-serif;margin-bottom:80px;background-color:#fff}body a{color:#08C}.footer{position:absolute;bottom:0;width:100%;height:60px;text-align:center;color:#999}input[type=checkbox]:checked+.label_hide_if_checked,input[type=checkbox]:checked+.label_hide_if_not_checked+.label_hide_if_checked{display:none}input[type=checkbox]:not(:checked)+.label_hide_if_checked+.label_hide_if_not_checked,input[type=checkbox]:not(:checked)+.label_hide_if_not_checked{display:none}.onoff-checkbox{width:15%}.onoffswitch{position:relative;width:110px;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none}.onoffswitch-checkbox{opacity:0;position:absolute}.onoffswitch-checkbox:before{content:"";display:inline-block;width:16px;height:16px;margin-right:10px;position:absolute;left:0;bottom:1px;background-color:#fff;border:1px solid #ccc;border-radius:0}.onoffswitch-label{display:block;overflow:hidden;cursor:pointer;border:2px solid #FFF!important;border-radius:50px!important}.onoffswitch-inner{display:block;transition:margin .3s ease-in 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.highlight{background-color:#F6F9FA}.result-content,.result-format,.result-source{margin-top:2px;margin-bottom:0;word-wrap:break-word;color:#666;font-size:13px}.result .highlight{font-weight:700}.result-source{font-size:10px;float:left}.result-format{font-size:10px;float:right}.result-abstract{margin-top:.5em;margin-bottom:.8em}.external-link{color:#068922;font-size:12px;margin-bottom:15px}.external-link a{margin-right:3px}.result-code,.result-default,.result-map,.result-torrent,.result-videos{clear:both;padding:.5em 4px}.result-code:hover,.result-default:hover,.result-map:hover,.result-torrent:hover,.result-videos:hover{background-color:#F6F9FA}.result-images{float:left!important;margin:0;padding:0}.result-images a{display:block;width:100%;background-size:cover}.result-images a .img-thumbnail{border:none!important;padding:0}.result-images a:focus,.result-images a:hover{outline:0}.result-images a:focus .img-thumbnail,.result-images a:hover .img-thumbnail{box-shadow:5px 5px 15px 0 #000}.result-images.js a .img-thumbnail{max-height:inherit;min-height:inherit}.result-images:not(.js){width:25%;padding:3px 13px 13px 3px}.result-images:not(.js) a .img-thumbnail{margin:0;max-height:128px;min-height:128px}.img-thumbnail{margin:5px;max-height:128px;min-height:128px}.result-videos{clear:both}.result-videos hr{margin:5px 0 15px 0}.result-videos .collapse{width:100%}.result-videos .in{margin-bottom:8px}.result-torrent{clear:both}.result-torrent b{margin-right:5px;margin-left:5px}.result-torrent .seeders{color:#2ecc71}.result-torrent .leechers{color:#F35E77}.result-metadata{clear:both;margin:1em}.result-metadata td{padding-right:1em;color:#A4A4A4}.result-metadata td:first-of-type{color:#666}.result-map{clear:both}.result-code{clear:both}.result-code .code-fork,.result-code .code-fork a{color:#666}.suggestion_item{margin:2px 5px;max-width:100%}.suggestion_item .btn{max-width:100%;white-space:normal;word-wrap:break-word;text-align:left}.result_download{margin-right:5px}#pagination{margin-top:30px;padding-bottom:60px}.label-default{color:#666;background:0 0}.result .text-muted small{word-wrap:break-word}.modal-wrapper{box-shadow:0 5px 15px rgba(0,0,0,.5)}.modal-wrapper{background-clip:padding-box;background-color:#fff;border:1px solid rgba(0,0,0,.2);border-radius:6px;box-shadow:0 3px 9px rgba(0,0,0,.5);outline:0 none;position:relative}@media screen and (max-width:75em){.img-thumbnail{object-fit:cover}}.infobox .panel-heading{background-color:#F6F9FA}.infobox .panel-heading .panel-title{font-weight:700}.infobox .header_url{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;display:block}.infobox p{font-family:"DejaVu Serif",Georgia,Cambria,"Times New Roman",Times,serif!important;font-style:italic}.infobox img{max-height:"250px"}.infobox .btn{background-color:#007AB8;border:none}.infobox .btn a{color:#fff;margin:5px}.infobox .infobox_part{margin-bottom:20px;word-wrap:break-word;table-layout:fixed}.infobox .infobox_part:last-child{margin-bottom:0}.infobox .infobox_toggle{width:100%;text-align:center;margin-bottom:0;cursor:pointer}.infobox .infobox_toggle:hover{background:#DDD}.infobox .infobox_checkbox~.infobox_body{max-height:300px;overflow:hidden}.infobox .infobox_checkbox:checked~.infobox_body{max-height:none}.infobox .infobox_checkbox~.infobox_toggle .infobox_label_down{display:block}.infobox .infobox_checkbox~.infobox_toggle .infobox_label_up{display:none}.infobox .infobox_checkbox:checked~.infobox_toggle .infobox_label_up{display:block}.infobox .infobox_checkbox:checked~.infobox_toggle .infobox_label_down{display:none}.infobox .infobox_checkbox~.infobox_body img.infobox_part{display:none}.infobox .infobox_checkbox:checked~.infobox_body img.infobox_part{display:block}#categories,.search_categories{text-transform:capitalize;margin-bottom:.5rem;display:flex;flex-wrap:wrap;flex-flow:row 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.btn:hover{background-color:#068922;color:#fff}.custom-select,.custom-select-rtl{appearance:none;-webkit-appearance:none;-moz-appearance:none;font-size:1.2rem;font-weight:400;background-color:#fff;border:#888 1px solid;color:#666;background:url(data:image/png;base64,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) 96% no-repeat}.custom-select-rtl{background-position-x:4%}.search-margin{margin-bottom:.6em}.visually-hidden{position:absolute!important;height:1px;width:1px;overflow:hidden;clip:rect(1px,1px,1px,1px);white-space:nowrap}.btn-danger,.label-danger{background:#c9432f}.btn-success,.label-success{background:#068922}select.form-control{border-color:#888!important}#advanced-search-container{display:none;text-align:left;margin-bottom:1rem;clear:both}#advanced-search-container .input-group-addon,#advanced-search-container label{font-size:1.2rem;font-weight:400;background-color:#fff;border:#DDD 1px solid;border-right:none;color:#666;padding-bottom:.4rem;padding-right:.7rem;padding-left:.7rem}#advanced-search-container .input-group-addon:last-child,#advanced-search-container label:last-child{border-right:#DDD 1px solid}#advanced-search-container input[type=radio]{display:none}#advanced-search-container input[type=radio]:checked+label{color:#29314D;font-weight:700;border-bottom:#01D7D4 5px 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.special{color:#000;background-color:#ffffc0;padding-left:5px;padding-right:5px}.code-highlight span.linenos.special{color:#000;background-color:#ffffc0;padding-left:5px;padding-right:5px}.code-highlight .hll{background-color:#ffc}.code-highlight{background:#282C34}.code-highlight .c{color:#556366;font-style:italic}.code-highlight .err{border:1px solid red}.code-highlight .k{color:#BE74D5;font-weight:700}.code-highlight .o{color:#D19A66}.code-highlight .ch{color:#556366;font-style:italic}.code-highlight .cm{color:#556366;font-style:italic}.code-highlight .cp{color:#BC7A00;font-style:italic}.code-highlight .cpf{color:#556366;font-style:italic}.code-highlight .c1{color:#556366;font-style:italic}.code-highlight .cs{color:#556366;font-style:italic}.code-highlight .gd{color:#A00000}.code-highlight .ge{font-style:italic}.code-highlight .gr{color:red}.code-highlight .gh{color:navy;font-weight:700}.code-highlight .gi{color:#00A000}.code-highlight .go{color:#888}.code-highlight 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\ No newline at end of file
+.searx-navbar{background:#29314D;height:2.3rem;font-size:1.3rem;line-height:1.3rem;padding:.5rem;font-weight:700;margin-bottom:.8rem}.searx-navbar a,.searx-navbar a:hover{margin-right:2rem;color:#fff;text-decoration:none}.searx-navbar .instance a{color:#01D7D4;margin-left:2rem}#main-logo{margin-top:20vh;margin-bottom:25px}#main-logo>img{max-width:350px;width:80%}*{border-radius:0!important}html{position:relative;min-height:100%;color:#29314D}body{font-family:Roboto,Helvetica,Arial,sans-serif;margin-bottom:80px;background-color:#fff}body a{color:#08C}.footer{position:absolute;bottom:0;width:100%;height:60px;text-align:center;color:#999}input[type=checkbox]:checked+.label_hide_if_checked,input[type=checkbox]:checked+.label_hide_if_not_checked+.label_hide_if_checked{display:none}input[type=checkbox]:not(:checked)+.label_hide_if_checked+.label_hide_if_not_checked,input[type=checkbox]:not(:checked)+.label_hide_if_not_checked{display:none}.onoff-checkbox{width:15%}.onoffswitch{position:relative;width:110px;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none}.onoffswitch-checkbox{opacity:0;position:absolute}.onoffswitch-checkbox:before{content:"";display:inline-block;width:16px;height:16px;margin-right:10px;position:absolute;left:0;bottom:1px;background-color:#fff;border:1px solid #ccc;border-radius:0}.onoffswitch-label{display:block;overflow:hidden;cursor:pointer;border:2px solid #FFF!important;border-radius:50px!important}.onoffswitch-inner{display:block;transition:margin .3s ease-in 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.highlight{background-color:#F6F9FA}.result-content,.result-format,.result-source{margin-top:2px;margin-bottom:0;word-wrap:break-word;color:#666;font-size:13px}.result .highlight{font-weight:700}.result-source{font-size:10px;float:left}.result-format{font-size:10px;float:right}.result-abstract{margin-top:.5em;margin-bottom:.8em}.external-link{color:#068922;font-size:12px;margin-bottom:15px}.external-link a{margin-right:3px}.result-code,.result-default,.result-map,.result-torrent,.result-videos{clear:both;padding:.5em 4px}.result-code:hover,.result-default:hover,.result-map:hover,.result-torrent:hover,.result-videos:hover{background-color:#F6F9FA}.result-images{float:left!important;margin:0;padding:0}.result-images a{display:block;width:100%;background-size:cover}.result-images a .img-thumbnail{border:none!important;padding:0}.result-images a:focus,.result-images a:hover{outline:0}.result-images a:focus .img-thumbnail,.result-images a:hover .img-thumbnail{box-shadow:5px 5px 15px 0 #000}.result-images.js a .img-thumbnail{max-height:inherit;min-height:inherit}.result-images:not(.js){width:25%;padding:3px 13px 13px 3px}.result-images:not(.js) a .img-thumbnail{margin:0;max-height:128px;min-height:128px}.img-thumbnail{margin:5px;max-height:128px;min-height:128px}.result-videos{clear:both}.result-videos hr{margin:5px 0 15px 0}.result-videos .collapse{width:100%}.result-videos .in{margin-bottom:8px}.result-torrent{clear:both}.result-torrent b{margin-right:5px;margin-left:5px}.result-torrent .seeders{color:#2ecc71}.result-torrent .leechers{color:#F35E77}.result-metadata{clear:both;margin:1em}.result-metadata td{padding-right:1em;color:#A4A4A4}.result-metadata td:first-of-type{color:#666}.result-map{clear:both}.result-code{clear:both}.result-code .code-fork,.result-code .code-fork a{color:#666}.suggestion_item{margin:2px 5px;max-width:100%}.suggestion_item 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diff --git a/searx/static/themes/oscar/css/logicodev.min.css.map b/searx/static/themes/oscar/css/logicodev.min.css.map
index 3e15ed5ec..50598d2ef 100644
--- a/searx/static/themes/oscar/css/logicodev.min.css.map
+++ b/searx/static/themes/oscar/css/logicodev.min.css.map
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\ No newline at end of file
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\ No newline at end of file
diff --git a/searx/static/themes/oscar/css/pointhi.css b/searx/static/themes/oscar/css/pointhi.css
index c648f2b60..64f612d79 100644
--- a/searx/static/themes/oscar/css/pointhi.css
+++ b/searx/static/themes/oscar/css/pointhi.css
@@ -688,6 +688,71 @@ input[type=checkbox]:not(:checked) + .label_hide_if_checked + .label_hide_if_not
   z-index: 1000000;
 }
 th:hover .engine-tooltip,
+td:hover .engine-tooltip,
 .engine-tooltip:hover {
   display: inline-block;
 }
+/* stacked-bar-chart */
+.stacked-bar-chart {
+  margin: 0;
+  padding: 0 0.125rem 0 3rem;
+  width: 100%;
+  width: -moz-available;
+  width: -webkit-fill-available;
+  width: fill;
+  flex-direction: row;
+  flex-wrap: nowrap;
+  flex-grow: 1;
+  align-items: center;
+  display: inline-flex;
+}
+.stacked-bar-chart-value {
+  width: 3rem;
+  display: inline-block;
+  position: absolute;
+  padding: 0 0.5rem;
+  text-align: right;
+}
+.stacked-bar-chart-base {
+  display: flex;
+  flex-shrink: 0;
+  flex-grow: 0;
+  flex-basis: unset;
+}
+.stacked-bar-chart-median {
+  display: flex;
+  flex-shrink: 0;
+  flex-grow: 0;
+  flex-basis: unset;
+  background: #000000;
+  border: 1px solid rgba(0, 0, 0, 0.9);
+  padding: 0.3rem 0;
+}
+.stacked-bar-chart-rate80 {
+  display: flex;
+  flex-shrink: 0;
+  flex-grow: 0;
+  flex-basis: unset;
+  background: transparent;
+  border: 1px solid rgba(0, 0, 0, 0.3);
+  padding: 0.3rem 0;
+}
+.stacked-bar-chart-rate95 {
+  display: flex;
+  flex-shrink: 0;
+  flex-grow: 0;
+  flex-basis: unset;
+  background: transparent;
+  border-bottom: 1px dotted rgba(0, 0, 0, 0.5);
+  padding: 0;
+}
+.stacked-bar-chart-rate100 {
+  display: flex;
+  flex-shrink: 0;
+  flex-grow: 0;
+  flex-basis: unset;
+  background: transparent;
+  border-left: 1px solid rgba(0, 0, 0, 0.9);
+  padding: 0.4rem 0;
+  width: 1px;
+}
diff --git a/searx/static/themes/oscar/css/pointhi.min.css b/searx/static/themes/oscar/css/pointhi.min.css
index 02bee6ad7..4332e4767 100644
--- a/searx/static/themes/oscar/css/pointhi.min.css
+++ b/searx/static/themes/oscar/css/pointhi.min.css
@@ -1 +1 @@
-html{position:relative;min-height:100%}body{margin-bottom:80px}.footer{position:absolute;bottom:0;width:100%;height:60px}input[type=checkbox]:checked+.label_hide_if_checked,input[type=checkbox]:checked+.label_hide_if_not_checked+.label_hide_if_checked{display:none}input[type=checkbox]:not(:checked)+.label_hide_if_checked+.label_hide_if_not_checked,input[type=checkbox]:not(:checked)+.label_hide_if_not_checked{display:none}.onoff-checkbox{width:15%}.onoffswitch{position:relative;width:110px;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none}.onoffswitch-checkbox{display:none}.onoffswitch-label{display:block;overflow:hidden;cursor:pointer;border:2px solid #FFF!important;border-radius:50px!important}.onoffswitch-inner{display:block;transition:margin .3s ease-in 0s}.onoffswitch-inner:after,.onoffswitch-inner:before{display:block;float:left;width:50%;height:30px;padding:0;line-height:40px;font-size:20px;box-sizing:border-box;content:"";background-color:#EEE}.onoffswitch-switch{display:block;width:37px;background-color:#0C0;position:absolute;top:0;bottom:0;right:0;border:2px solid #FFF!important;border-radius:50px!important;transition:all .3s ease-in 0s}.onoffswitch-checkbox:checked+.onoffswitch-label .onoffswitch-inner{margin-right:0}.onoffswitch-checkbox:checked+.onoffswitch-label .onoffswitch-switch{right:71px;background-color:#A1A1A1}.result_header{margin-bottom:5px;margin-top:20px}.result_header .favicon{margin-bottom:-3px}.result_header a{vertical-align:bottom}.result_header a .highlight{font-weight:700}.result-content{margin-top:5px;word-wrap:break-word}.result-content .highlight{font-weight:700}.result-default{clear:both}.result-images{float:left!important;height:138px}.img-thumbnail{margin:5px;max-height:128px}.result-videos{clear:both}.result-torrents{clear:both}.result-map{clear:both}.result-code{clear:both}.suggestion_item{margin:2px 5px;max-width:100%}.suggestion_item .btn{max-width:100%;white-space:normal;word-wrap:break-word;text-align:left}.result_download{margin-right:5px}#pagination{margin-top:30px;padding-bottom:50px}.label-default{color:#AAA;background:#FFF}.result .text-muted small{word-wrap:break-word}.modal-wrapper{box-shadow:0 5px 15px rgba(0,0,0,.5)}.modal-wrapper{background-clip:padding-box;background-color:#fff;border:1px solid rgba(0,0,0,.2);border-radius:6px;box-shadow:0 3px 9px rgba(0,0,0,.5);outline:0 none;position:relative}.highlight{font-weight:700}.infobox img{max-height:250px}.infobox .infobox_part{margin-bottom:20px;word-wrap:break-word;table-layout:fixed}.infobox .infobox_part:last-child{margin-bottom:0}.infobox .header_url{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;display:block}.infobox .infobox_toggle{width:100%;text-align:center;margin-bottom:0}.infobox .infobox_checkbox~.infobox_body{max-height:300px;overflow:hidden}.infobox .infobox_checkbox:checked~.infobox_body{max-height:none}.infobox .infobox_checkbox~.infobox_toggle .infobox_label_down{display:block}.infobox .infobox_checkbox~.infobox_toggle .infobox_label_up{display:none}.infobox .infobox_checkbox:checked~.infobox_toggle .infobox_label_up{display:block}.infobox .infobox_checkbox:checked~.infobox_toggle .infobox_label_down{display:none}.infobox .infobox_checkbox~.infobox_body img.infobox_part{display:none}.infobox .infobox_checkbox:checked~.infobox_body img.infobox_part{display:block}#categories,.search_categories{text-transform:capitalize;margin-bottom:1.5rem;margin-top:1.5rem;display:flex;flex-wrap:wrap;align-content:stretch}#categories .input-group-addon,#categories label,.search_categories .input-group-addon,.search_categories label{flex-grow:1;flex-basis:auto;font-size:1.3rem;font-weight:400;background-color:#fff;border:#DDD 1px solid;border-right:none;color:#333;padding-bottom:.8rem;padding-top:.8rem;text-align:center;min-width:50px}#categories .input-group-addon:last-child,#categories label:last-child,.search_categories .input-group-addon:last-child,.search_categories label:last-child{border-right:#DDD 1px solid}#categories input[type=checkbox]:checked+label,.search_categories input[type=checkbox]:checked+label{color:#000;font-weight:700;background-color:#EEE}.visually-hidden{position:absolute!important;height:1px;width:1px;overflow:hidden;clip:rect(1px 1px 1px 1px);clip:rect(1px,1px,1px,1px);white-space:nowrap}#advanced-search-container{display:none;text-align:center;margin-bottom:1rem;clear:both}#advanced-search-container .input-group-addon,#advanced-search-container label{font-size:1.3rem;font-weight:400;background-color:#fff;border:#DDD 1px 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diff --git a/searx/static/themes/oscar/css/pointhi.min.css.map b/searx/static/themes/oscar/css/pointhi.min.css.map
index 1d18b1fd7..abb30817f 100644
--- a/searx/static/themes/oscar/css/pointhi.min.css.map
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diff --git a/searx/static/themes/oscar/js/searx.min.js b/searx/static/themes/oscar/js/searx.min.js
index 8b17d4f61..b31aad6f0 100644
--- a/searx/static/themes/oscar/js/searx.min.js
+++ b/searx/static/themes/oscar/js/searx.min.js
@@ -1,4 +1,4 @@
-/*! oscar/searx.min.js | 05-04-2021 |   */
+/*! oscar/searx.min.js | 21-04-2021 |   */
 
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meta;",s=$(this).data("osm-id"),i=$(this).data("osm-type"),n=$(this).data("result-table"),o="#"+$(this).data("result-table-loadicon"),r=["addr:city","addr:country","addr:housenumber","addr:postcode","addr:street"];if(s&&i&&n){var n="#"+n,l=null;switch(i){case"node":l=e+"node("+s+");"+a;break;case"way":l=e+"way("+s+");"+a;break;case"relation":l=e+"relation("+s+");"+a}l&&$.ajax(l).done(function(t){if(t&&t.elements&&t.elements[0]){var e,a=t.elements[0],s=$(n).html();for(e in a.tags)if(null===a.tags.name||-1==r.indexOf(e)){switch(s+="<tr><td>"+e+"</td><td>",e){case"phone":case"fax":s+='<a href="tel:'+a.tags[e].replace(/ /g,"")+'">'+a.tags[e]+"</a>";break;case"email":s+='<a href="mailto:'+a.tags[e]+'">'+a.tags[e]+"</a>";break;case"website":case"url":s+='<a href="'+a.tags[e]+'">'+a.tags[e]+"</a>";break;case"wikidata":s+='<a href="https://www.wikidata.org/wiki/'+a.tags[e]+'">'+a.tags[e]+"</a>";break;case"wikipedia":if(-1!=a.tags[e].indexOf(":")){s+='<a href="https://'+a.tags[e].substring(0,a.tags[e].indexOf(":"))+".wikipedia.org/wiki/"+a.tags[e].substring(a.tags[e].indexOf(":")+1)+'">'+a.tags[e]+"</a>";break}default:s+=a.tags[e]}s+="</td></tr>"}$(n).html(s),$(n).removeClass("hidden"),$(o).addClass("hidden")}}).fail(function(){$(o).html($(o).html()+'<p class="text-muted">'+searx.translations.could_not_load+"</p>")})}$(this).off(t)}),$(".searx_init_map").on("click",function(t){var e=$(this).data("leaflet-target"),a=$(this).data("map-lon"),s=$(this).data("map-lat"),i=$(this).data("map-zoom"),n=$(this).data("map-boundingbox"),o=$(this).data("map-geojson");n&&(southWest=L.latLng(n[0],n[2]),northEast=L.latLng(n[1],n[3]),map_bounds=L.latLngBounds(southWest,northEast)),L.Icon.Default.imagePath="./static/themes/oscar/css/images/";var r=L.map(e),e=new L.TileLayer("https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png",{minZoom:1,maxZoom:19,attribution:'Map data © <a href="https://openstreetmap.org">OpenStreetMap</a> contributors'});new L.TileLayer("https://maps.wikimedia.org/osm-intl/{z}/{x}/{y}.png",{minZoom:1,maxZoom:19,attribution:'Wikimedia maps beta | Maps data © <a href="https://openstreetmap.org">OpenStreetMap</a> contributors'});setTimeout(function(){map_bounds?r.fitBounds(map_bounds,{maxZoom:17}):a&&s&&(i?r.setView(new L.LatLng(s,a),i):r.setView(new L.LatLng(s,a),8))},0),r.addLayer(e),L.control.layers({"OSM Mapnik":e}).addTo(r),o&&L.geoJson(o).addTo(r),$(this).off(t)})}),$(document).ready(function(){$("#allow-all-engines").click(function(){$(".onoffswitch-checkbox").each(function(){this.checked=!1})}),$("#disable-all-engines").click(function(){$(".onoffswitch-checkbox").each(function(){this.checked=!0})})}),function(o,c){function t(t,e,a,s,i){this.container_selector=t,this.results_selector=e,this.img_selector=a,this.margin=s,this.maxHeight=i,this.isAlignDone=!0}t.prototype._getHeigth=function(t,e){for(var a,s=0,i=0;i<t.length;i++)0<(a=t[i]).naturalWidth&&0<a.naturalHeight?s+=a.naturalWidth/a.naturalHeight:s+=1;return(e-t.length*this.margin)/s},t.prototype._setSize=function(t,e){for(var a,s,i=t.length,n=0;n<i;n++)a=0<(s=t[n]).naturalWidth&&0<s.naturalHeight?e*s.naturalWidth/s.naturalHeight:e,s.style.width=a+"px",s.style.height=e+"px",s.style.marginLeft="3px",s.style.marginTop="3px",s.style.marginRight=this.margin-7+"px",s.style.marginBottom=this.margin-7+"px",(s=s.parentNode.parentNode).classList.contains("js")||s.classList.add("js")},t.prototype._alignImgs=function(t){for(var e,a,s,i,n=c.querySelector(this.container_selector),o=window.getComputedStyle(n),r=parseInt(o.getPropertyValue("padding-left"),10),o=parseInt(o.getPropertyValue("padding-right"),10),l=n.clientWidth-r-o;0<t.length;){for(e=!0,s=1;s<=t.length&&e;s++)a=t.slice(0,s),(i=this._getHeigth(a,l))<this.maxHeight&&(this._setSize(a,i),t=t.slice(s),e=!1);if(e){this._setSize(a,Math.min(this.maxHeight,i));break}}},t.prototype.align=function(){for(var t=c.querySelectorAll(this.results_selector),e=t.length,a=null,s=null,i=[],n=0;n<e;n++)(s=t[n]).previousElementSibling!==a&&0<i.length&&(this._alignImgs(i),i=[]),i.push(s.querySelector(this.img_selector)),a=s;0<i.length&&this._alignImgs(i)},t.prototype.watch=function(){var t,e,a=this,s=c.querySelectorAll(this.results_selector),i=s.length;function n(){a.isAlignDone&&(a.isAlignDone=!1,setTimeout(function(){a.align(),a.isAlignDone=!0},100))}for(o.addEventListener("pageshow",n),o.addEventListener("load",n),o.addEventListener("resize",n),t=0;t<i;t++)null!=(e=s[t].querySelector(this.img_selector))&&(e.addEventListener("load",n),e.addEventListener("error",n))},o.searx.ImageLayout=t}(window,document);
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\ No newline at end of file
diff --git a/searx/static/themes/oscar/src/less/logicodev-dark/oscar.less b/searx/static/themes/oscar/src/less/logicodev-dark/oscar.less
index ff37594c8..38a4424ac 100644
--- a/searx/static/themes/oscar/src/less/logicodev-dark/oscar.less
+++ b/searx/static/themes/oscar/src/less/logicodev-dark/oscar.less
@@ -1,4 +1,7 @@
 @import "../logicodev/variables.less";
+
+@stacked-bar-chart: rgb(213, 216, 215, 1);
+
 @import "../logicodev/footer.less";
 @import "../logicodev/checkbox.less";
 @import "../logicodev/onoff.less";
diff --git a/searx/static/themes/oscar/src/less/logicodev/preferences.less b/searx/static/themes/oscar/src/less/logicodev/preferences.less
index ccd0b0249..32e230413 100644
--- a/searx/static/themes/oscar/src/less/logicodev/preferences.less
+++ b/searx/static/themes/oscar/src/less/logicodev/preferences.less
@@ -20,12 +20,72 @@ input.cursor-text {
     padding: 0.5rem 1rem;
     margin: 0rem 0 0 2rem;
     border: 1px solid #ddd;
+    box-shadow: 2px 2px 2px 0px rgba(0,0,0,0.1);
     background: white;
     font-size: 14px;
     font-weight: normal;
     z-index: 1000000; 
 }
 
-th:hover .engine-tooltip, .engine-tooltip:hover {
+td:hover .engine-tooltip, th:hover .engine-tooltip, .engine-tooltip:hover {
     display: inline-block;
-}
\ No newline at end of file
+}
+
+/* stacked-bar-chart */
+.stacked-bar-chart {
+    margin: 0;
+    padding: 0 0.125rem 0 3rem;
+    width: 100%;
+    width: -moz-available;
+    width: -webkit-fill-available;
+    width: fill;
+    flex-direction: row;
+    flex-wrap: nowrap;
+    flex-grow: 1;
+    align-items: center;
+    display: inline-flex;
+}
+
+.stacked-bar-chart-value {
+    width: 3rem;
+    display: inline-block;
+    position: absolute;
+    padding: 0 0.5rem;   
+    text-align: right;
+}
+
+.stacked-bar-chart-base {
+    display:flex;
+    flex-shrink: 0;
+    flex-grow: 0;
+    flex-basis: unset;
+}
+
+.stacked-bar-chart-median {
+    .stacked-bar-chart-base();
+    background: @stacked-bar-chart;
+    border: 1px solid fade(@stacked-bar-chart, 90%);
+    padding: 0.3rem 0;
+}
+
+.stacked-bar-chart-rate80 {
+    .stacked-bar-chart-base();
+    background: transparent;
+    border: 1px solid fade(@stacked-bar-chart, 30%);
+    padding: 0.3rem 0;
+}
+
+.stacked-bar-chart-rate95 {
+    .stacked-bar-chart-base();
+    background: transparent;
+    border-bottom: 1px dotted fade(@stacked-bar-chart, 50%);
+    padding: 0;
+}
+
+.stacked-bar-chart-rate100 {
+    .stacked-bar-chart-base();
+    background: transparent;
+    border-left: 1px solid fade(@stacked-bar-chart, 90%);
+    padding: 0.4rem 0;
+    width: 1px;
+}
diff --git a/searx/static/themes/oscar/src/less/logicodev/variables.less b/searx/static/themes/oscar/src/less/logicodev/variables.less
index 4ee8df8e7..ae2516c05 100644
--- a/searx/static/themes/oscar/src/less/logicodev/variables.less
+++ b/searx/static/themes/oscar/src/less/logicodev/variables.less
@@ -14,3 +14,5 @@
 @light-green: #01D7D4;
 @orange: #FFA92F;
 @dark-red: #c9432f;
+
+@stacked-bar-chart: rgb(0, 0, 0);
diff --git a/searx/static/themes/oscar/src/less/pointhi/oscar.less b/searx/static/themes/oscar/src/less/pointhi/oscar.less
index 037bfa59b..6f92a0791 100644
--- a/searx/static/themes/oscar/src/less/pointhi/oscar.less
+++ b/searx/static/themes/oscar/src/less/pointhi/oscar.less
@@ -1,3 +1,5 @@
+@import "variables.less";
+
 @import "footer.less";
 
 @import "checkbox.less";
diff --git a/searx/static/themes/oscar/src/less/pointhi/preferences.less b/searx/static/themes/oscar/src/less/pointhi/preferences.less
index f3a6bee22..cb63674ed 100644
--- a/searx/static/themes/oscar/src/less/pointhi/preferences.less
+++ b/searx/static/themes/oscar/src/less/pointhi/preferences.less
@@ -14,6 +14,66 @@
     z-index: 1000000; 
 }
 
-th:hover .engine-tooltip, .engine-tooltip:hover {
+th:hover .engine-tooltip, td:hover .engine-tooltip, .engine-tooltip:hover {
     display: inline-block;
 }
+
+/* stacked-bar-chart */
+.stacked-bar-chart {
+    margin: 0;
+    padding: 0 0.125rem 0 3rem;
+    width: 100%;
+    width: -moz-available;
+    width: -webkit-fill-available;
+    width: fill;
+    flex-direction: row;
+    flex-wrap: nowrap;
+    flex-grow: 1;
+    align-items: center;
+    display: inline-flex;
+}
+
+.stacked-bar-chart-value {
+    width: 3rem;
+    display: inline-block;
+    position: absolute;
+    padding: 0 0.5rem;   
+    text-align: right;
+}
+
+.stacked-bar-chart-base {
+    display:flex;
+    flex-shrink: 0;
+    flex-grow: 0;
+    flex-basis: unset;
+}
+
+.stacked-bar-chart-median {
+    .stacked-bar-chart-base();
+    background: @stacked-bar-chart;
+    border: 1px solid fade(@stacked-bar-chart, 90%);
+    padding: 0.3rem 0;
+}
+
+.stacked-bar-chart-rate80 {
+    .stacked-bar-chart-base();
+    background: transparent;
+    border: 1px solid fade(@stacked-bar-chart, 30%);
+    padding: 0.3rem 0;
+}
+
+.stacked-bar-chart-rate95 {
+    .stacked-bar-chart-base();
+    background: transparent;
+    border-bottom: 1px dotted fade(@stacked-bar-chart, 50%);
+    padding: 0;
+}
+
+.stacked-bar-chart-rate100 {
+    .stacked-bar-chart-base();
+    background: transparent;
+    border-left: 1px solid fade(@stacked-bar-chart, 90%);
+    padding: 0.4rem 0;
+    width: 1px;
+}
+
diff --git a/searx/static/themes/oscar/src/less/pointhi/variables.less b/searx/static/themes/oscar/src/less/pointhi/variables.less
new file mode 100644
index 000000000..991f03098
--- /dev/null
+++ b/searx/static/themes/oscar/src/less/pointhi/variables.less
@@ -0,0 +1 @@
+@stacked-bar-chart: rgb(0, 0, 0);
diff --git a/searx/static/themes/simple/css/searx-rtl.css b/searx/static/themes/simple/css/searx-rtl.css
index 6b9b47d85..0da2850c5 100644
--- a/searx/static/themes/simple/css/searx-rtl.css
+++ b/searx/static/themes/simple/css/searx-rtl.css
@@ -1,4 +1,4 @@
-/*! searx | 23-03-2021 |  */
+/*! searx | 21-04-2021 |  */
 /*
 * searx, A privacy-respecting, hackable metasearch engine
 *
@@ -692,6 +692,12 @@ html.js .show_if_nojs {
 .danger {
   background-color: #fae1e1;
 }
+.warning {
+  background: #faf5e1;
+}
+.success {
+  background: #e3fae1;
+}
 .badge {
   display: inline-block;
   color: #fff;
@@ -1147,6 +1153,69 @@ select:focus {
     transform: rotate(360deg);
   }
 }
+/* -- stacked bar chart -- */
+.stacked-bar-chart {
+  margin: 0;
+  padding: 0 0.125rem 0 4rem;
+  width: 100%;
+  width: -moz-available;
+  width: -webkit-fill-available;
+  width: fill;
+  flex-direction: row;
+  flex-wrap: nowrap;
+  align-items: center;
+  display: inline-flex;
+}
+.stacked-bar-chart-value {
+  width: 3rem;
+  display: inline-block;
+  position: absolute;
+  padding: 0 0.5rem;
+  text-align: right;
+}
+.stacked-bar-chart-base {
+  display: flex;
+  flex-shrink: 0;
+  flex-grow: 0;
+  flex-basis: unset;
+}
+.stacked-bar-chart-median {
+  display: flex;
+  flex-shrink: 0;
+  flex-grow: 0;
+  flex-basis: unset;
+  background: #000000;
+  border: 1px solid rgba(0, 0, 0, 0.9);
+  padding: 0.3rem 0;
+}
+.stacked-bar-chart-rate80 {
+  display: flex;
+  flex-shrink: 0;
+  flex-grow: 0;
+  flex-basis: unset;
+  background: transparent;
+  border: 1px solid rgba(0, 0, 0, 0.3);
+  padding: 0.3rem 0;
+}
+.stacked-bar-chart-rate95 {
+  display: flex;
+  flex-shrink: 0;
+  flex-grow: 0;
+  flex-basis: unset;
+  background: transparent;
+  border-bottom: 1px dotted rgba(0, 0, 0, 0.5);
+  padding: 0;
+}
+.stacked-bar-chart-rate100 {
+  display: flex;
+  flex-shrink: 0;
+  flex-grow: 0;
+  flex-basis: unset;
+  background: transparent;
+  border-left: 1px solid rgba(0, 0, 0, 0.9);
+  padding: 0.4rem 0;
+  width: 1px;
+}
 /*! Autocomplete.js v2.6.3 | license MIT | (c) 2017, Baptiste Donaux | http://autocomplete-js.com */
 .autocomplete {
   position: absolute;
@@ -1435,8 +1504,10 @@ select:focus {
   font-size: 14px;
   font-weight: normal;
   z-index: 1000000;
+  text-align: left;
 }
 #main_preferences th:hover .engine-tooltip,
+#main_preferences td:hover .engine-tooltip,
 #main_preferences .engine-tooltip:hover {
   display: inline-block;
 }
diff --git a/searx/static/themes/simple/css/searx-rtl.min.css b/searx/static/themes/simple/css/searx-rtl.min.css
index 3b5d7f753..615b88ec5 100644
--- a/searx/static/themes/simple/css/searx-rtl.min.css
+++ b/searx/static/themes/simple/css/searx-rtl.min.css
@@ -1 +1 @@
-/*! searx | 23-03-2021 |  *//*! normalize.css v8.0.0 | MIT License | github.com/necolas/normalize.css */button,hr,input{overflow:visible}[type=checkbox],[type=radio],legend{padding:0;box-sizing:border-box}.badge,progress,sub,sup{vertical-align:baseline}.autocomplete>ul,.list-unstyled{list-style-type:none}.tabs>section,legend{box-sizing:border-box}#main_preferences h1 span,#main_stats h1 span,.index h1{visibility:hidden}#apis,#pagination,#pagination br,#sidebar .infobox .attributes,#sidebar .infobox .urls,#sidebar .infobox br,.result .break,footer{clear:both}html{line-height:1.15}h1{font-size:2em;margin:.67em 0}hr{box-sizing:content-box;height:0}code,kbd,pre,samp{font-family:monospace,monospace;font-size:1em}a{background-color:transparent}abbr[title]{border-bottom:none;text-decoration:underline;text-decoration:underline dotted}b,strong{font-weight:bolder}small{font-size:80%}sub,sup{font-size:75%;line-height:0;position:relative}sub{bottom:-.25em}sup{top:-.5em}img{border-style:none}button,input,optgroup,select,textarea{font-family:inherit;font-size:100%;line-height:1.15;margin:0}button,select{text-transform:none}[type=button],[type=reset],[type=submit],button{-webkit-appearance:button}[type=button]::-moz-focus-inner,[type=reset]::-moz-focus-inner,[type=submit]::-moz-focus-inner,button::-moz-focus-inner{border-style:none;padding:0}[type=button]:-moz-focusring,[type=reset]:-moz-focusring,[type=submit]:-moz-focusring,button:-moz-focusring{outline:ButtonText dotted 1px}fieldset{padding:.35em .75em .625em}legend{color:inherit;display:table;max-width:100%;white-space:normal}.badge,.search_box{white-space:nowrap}textarea{overflow:auto}[type=number]::-webkit-inner-spin-button,[type=number]::-webkit-outer-spin-button{height:auto}[type=search]{-webkit-appearance:textfield;outline-offset:-2px}[type=search]::-webkit-search-decoration{-webkit-appearance:none}::-webkit-file-upload-button{-webkit-appearance:button;font:inherit}.dialog-error:before,.dialog-modal:before,.dialog-warning:before,.ion-icon-big:before,.ion-icon:before{font-family:ion}details{display:block}summary{display:list-item}[hidden],html.js .show_if_nojs,html.no-js .hide_if_nojs,template{display:none}.code-highlight pre{overflow:auto;background-color:inherit;color:inherit;border:inherit;line-height:125%}.code-highlight .linenos{-webkit-touch-callout:none;-webkit-user-select:none;-khtml-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none;cursor:default;margin-right:8px;text-align:right}.btn-collapse,.tabs>label,select:focus,select:hover{cursor:pointer}.badge,.center{text-align:center}.code-highlight .linenos::selection{background:0 0}.code-highlight .linenos::-moz-selection{background:0 0}.code-highlight span.linenos,.code-highlight td.linenos .normal{color:inherit;background-color:transparent;padding-left:5px;padding-right:5px}.code-highlight span.linenos.special,.code-highlight td.linenos .special{color:#000;background-color:#ffffc0;padding-left:5px;padding-right:5px}.code-highlight .hll{background-color:#ffc}.code-highlight{background:#f8f8f8}.code-highlight .c{color:#408080;font-style:italic}.code-highlight .err{border:1px solid red}.code-highlight .k{color:green;font-weight:700}.code-highlight .o{color:#666}.code-highlight .ch,.code-highlight 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#sidebar{position:relative;top:auto;order:2}#main_results div#results.only_template_images #urls{position:relative;order:1}#main_results div#results.only_template_images #backToTop{right:.5em;left:auto}#main_results div#results.only_template_images #pagination{position:relative;order:3}@media screen and (max-width:50em){article[data-vim-selected]::before{display:none;content:""}#linkto_preferences{display:none;postion:fixed!important;top:100px;right:0}#sidebar{margin:0 5px 2px}#corrections{margin:1em 5px}#results{margin:0;padding:0;width:initial}#backToTop{left:40em;bottom:35px}.result{padding:8px 10px 6px}.result-images{margin:0;padding:0;border:none}}@media screen and (max-width:35em){.result-videos img.thumbnail{float:none!important}.result-videos .content{overflow:inherit}}pre code{white-space:pre-wrap}#search_submit{left:1px;right:auto}
\ No newline at end of file
diff --git a/searx/static/themes/simple/css/searx.css b/searx/static/themes/simple/css/searx.css
index 484fdc82d..15b9f0853 100644
--- a/searx/static/themes/simple/css/searx.css
+++ b/searx/static/themes/simple/css/searx.css
@@ -1,4 +1,4 @@
-/*! searx | 23-03-2021 |  */
+/*! searx | 21-04-2021 |  */
 /*
 * searx, A privacy-respecting, hackable metasearch engine
 *
@@ -692,6 +692,12 @@ html.js .show_if_nojs {
 .danger {
   background-color: #fae1e1;
 }
+.warning {
+  background: #faf5e1;
+}
+.success {
+  background: #e3fae1;
+}
 .badge {
   display: inline-block;
   color: #fff;
@@ -1147,6 +1153,69 @@ select:focus {
     transform: rotate(360deg);
   }
 }
+/* -- stacked bar chart -- */
+.stacked-bar-chart {
+  margin: 0;
+  padding: 0 0.125rem 0 4rem;
+  width: 100%;
+  width: -moz-available;
+  width: -webkit-fill-available;
+  width: fill;
+  flex-direction: row;
+  flex-wrap: nowrap;
+  align-items: center;
+  display: inline-flex;
+}
+.stacked-bar-chart-value {
+  width: 3rem;
+  display: inline-block;
+  position: absolute;
+  padding: 0 0.5rem;
+  text-align: right;
+}
+.stacked-bar-chart-base {
+  display: flex;
+  flex-shrink: 0;
+  flex-grow: 0;
+  flex-basis: unset;
+}
+.stacked-bar-chart-median {
+  display: flex;
+  flex-shrink: 0;
+  flex-grow: 0;
+  flex-basis: unset;
+  background: #000000;
+  border: 1px solid rgba(0, 0, 0, 0.9);
+  padding: 0.3rem 0;
+}
+.stacked-bar-chart-rate80 {
+  display: flex;
+  flex-shrink: 0;
+  flex-grow: 0;
+  flex-basis: unset;
+  background: transparent;
+  border: 1px solid rgba(0, 0, 0, 0.3);
+  padding: 0.3rem 0;
+}
+.stacked-bar-chart-rate95 {
+  display: flex;
+  flex-shrink: 0;
+  flex-grow: 0;
+  flex-basis: unset;
+  background: transparent;
+  border-bottom: 1px dotted rgba(0, 0, 0, 0.5);
+  padding: 0;
+}
+.stacked-bar-chart-rate100 {
+  display: flex;
+  flex-shrink: 0;
+  flex-grow: 0;
+  flex-basis: unset;
+  background: transparent;
+  border-left: 1px solid rgba(0, 0, 0, 0.9);
+  padding: 0.4rem 0;
+  width: 1px;
+}
 /*! Autocomplete.js v2.6.3 | license MIT | (c) 2017, Baptiste Donaux | http://autocomplete-js.com */
 .autocomplete {
   position: absolute;
@@ -1435,8 +1504,10 @@ select:focus {
   font-size: 14px;
   font-weight: normal;
   z-index: 1000000;
+  text-align: left;
 }
 #main_preferences th:hover .engine-tooltip,
+#main_preferences td:hover .engine-tooltip,
 #main_preferences .engine-tooltip:hover {
   display: inline-block;
 }
diff --git a/searx/static/themes/simple/css/searx.min.css b/searx/static/themes/simple/css/searx.min.css
index 2757ba434..52ad98ecd 100644
--- a/searx/static/themes/simple/css/searx.min.css
+++ b/searx/static/themes/simple/css/searx.min.css
@@ -1 +1 @@
-/*! searx | 23-03-2021 |  *//*! normalize.css v8.0.0 | MIT License | github.com/necolas/normalize.css */button,hr,input{overflow:visible}[type=checkbox],[type=radio],legend{padding:0;box-sizing:border-box}.badge,progress,sub,sup{vertical-align:baseline}.autocomplete>ul,.list-unstyled{list-style-type:none}.tabs>section,legend{box-sizing:border-box}#main_preferences h1 span,#main_stats h1 span,.index h1{visibility:hidden}#apis,#pagination,#pagination br,#sidebar .infobox .attributes,#sidebar .infobox .urls,#sidebar .infobox br,.result .break,footer{clear:both}html{line-height:1.15}h1{font-size:2em;margin:.67em 0}hr{box-sizing:content-box;height:0}code,kbd,pre,samp{font-family:monospace,monospace;font-size:1em}a{background-color:transparent}abbr[title]{border-bottom:none;text-decoration:underline;text-decoration:underline 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.engine-tooltip{display:inline-block}#search{padding:0 2em;margin:0;background:#f7f7f7;border-bottom:1px solid #d7d7d7}#search_wrapper{padding:10px 0}.search_box{margin:0 12px 0 0;display:inline-flex;flex-direction:row}#clear_search,#q,#send_search{border-collapse:separate;box-sizing:border-box;margin:0;padding:2px;height:2.2em;background:#FFF;color:#222;font-size:16px;outline:0}#clear_search{display:block;width:1.8em;border-top:1px solid #3498DB;border-bottom:1px solid #3498DB;border-right:none;border-left:none;border-radius:0;z-index:10000}#clear_search:hover{color:#3498DB}#clear_search.empty *{display:none}#q::-ms-clear,#q::-webkit-search-cancel-button{display:none}#q,#send_search{display:block!important;border:1px solid #3498DB;border-radius:0;z-index:2}#q{outline:0;padding-left:8px;padding-right:0!important;border-right:none;width:40em}#send_search{border-left:none;width:2.2em}#send_search:hover{cursor:pointer;background-color:#3498DB;color:#ECF0F1}.no-js #send_search{width:auto!important}.search_filters{display:inline-block;vertical-align:middle}@media screen and (max-width:75em){#categories{font-size:90%;clear:both}#categories .checkbox_container{margin:auto}html.touch #main_index #categories_container,html.touch #main_results #categories_container{width:1000px;width:-moz-max-content;width:-webkit-max-content;width:max-content}html.touch #main_index #categories_container .category,html.touch #main_results #categories_container .category{display:inline-block;width:auto}html.touch #main_index #categories,html.touch #main_results #categories{width:100%;margin:0;text-align:left;overflow-x:scroll;overflow-y:hidden;-webkit-overflow-scrolling:touch}}@media screen and (max-width:50em){#search{width:100%;margin:0;padding:.1em 0 0}#search_wrapper{width:100%;margin:0 0 .7em;padding:0}.search_box{width:99%;margin:.1em;padding:0 .1em 0 0;display:flex;flex-direction:row}#q{width:auto!important;flex:1}.search_filters{display:block;margin:.5em}.language,.time_range{width:45%}.category{display:block;width:90%}.category label{border-bottom:0}}#categories{margin:0 10px 0 0;user-select:none}#categories::-webkit-scrollbar{width:0;height:0}.category{display:inline-block;margin:0 3px;padding:0}.category input{display:none}.category label{cursor:pointer;padding:4px 10px;margin:0;display:block;text-transform:capitalize;font-size:.9em;border-bottom:2px solid transparent;-webkit-touch-callout:none;-webkit-user-select:none;-khtml-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none}body,html,main{padding:0;margin:0}.category input[type=checkbox]:focus+label{box-shadow:0 0 8px #3498DB}.category input[type=checkbox]:checked+label{background:#3498DB;color:#FFF;border-bottom:2px solid #084999}#categories_container .help{position:absolute;width:100%;bottom:-20px;overflow:hidden;opacity:0;transition:opacity 1s ease;font-size:.8em;text-position:center;background:#fff}footer p,html{font-size:.9em}#categories_container:hover .help{opacity:.8;transition:opacity 1s ease}html{font-family:arial,sans-serif;-webkit-text-size-adjust:100%;-ms-text-size-adjust:100%;-moz-text-size-adjust:100%;text-size-adjust:100%;color:#444}#main_about,#main_preferences,#main_stats{margin:3em;width:auto}footer{bottom:0;height:3em;margin:1em 0;padding:1em 0;text-align:center}#main_preferences h1,#main_stats h1{background:url(../img/searx.png) no-repeat;background-size:auto 75%;min-height:40px;margin:0 auto}#results button[type=submit],input[type=submit]{padding:.5rem;margin:2px 4px;display:inline-block;background:#3498DB;color:#FFF;-webkit-border-radius:4px;-moz-border-radius:4px;border-radius:4px;border:0;cursor:pointer}a{text-decoration:none;color:#29314d}a:visited,a:visited .highlight{color:#684898}article[data-vim-selected]{background:#f7f7f7}article[data-vim-selected]::before{position:absolute;left:1em;padding:2px;content:">";font-weight:700;color:#3498DB}article.result-images[data-vim-selected]{background:#3498DB}article.result-images[data-vim-selected]::before{display:none;content:""}.result{margin:19px 0 18px;padding:0}.result h3{font-size:1.1em;word-wrap:break-word;margin:5px 0 0;padding:0}.result h3 a{color:#084999;font-weight:400;font-size:1.1em}.result h3 a:visited{color:#684898}.result h3 a:focus,.result h3 a:hover{text-decoration:underline;border:none;-webkit-box-shadow:none;box-shadow:none;outline:0}.result .cache_link,.result .proxyfied_link{font-size:.9em!important}.result .altlink,.result .content,.result .stat,.result .url{font-size:.9em;padding:0;max-width:54em;word-wrap:break-word}.result .altlink,.result .content,.result .stat{margin:0;line-height:1.24}.result .altlink .highlight,.result .content .highlight,.result .stat .highlight{color:#000;background:inherit;font-weight:700}.result .codelines .highlight{color:inherit;background:inherit;font-weight:400}.result .url{margin:0 0 3px;color:#25a55b}.result .published_date{font-size:.8em;color:#888}.result img.thumbnail{float:left;padding:0 5px 10px 0;width:20em;min-width:20em;min-height:8em}.result img.image{float:left;padding:0 5px 10px 0;width:100px;max-height:100px;object-fit:scale-down;object-position:right top}.category-social .image{width:auto!important;min-width:48px;min-height:48px;padding:0 5px 25px 0!important}.result-videos .content{overflow:hidden}.engines{float:right;color:#888}.engines span{font-size:smaller;margin:0 .5em 0 0}.result-images,.result-images img{margin:0;padding:0;max-height:200px}.small_font{font-size:.8em}.highlight{color:#094089;background:inherit;font-weight:700}.result-images{display:inline-block;position:relative}.result-images img{float:inherit;border:none;background:#084999}.result-images span a{display:none;color:#FFF}.result-images:hover span a{display:block;position:absolute;bottom:0;right:0;padding:4px;margin:0 0 4px 4px;background-color:rgba(0,0,0,.6);font-size:.7em}.torrent_result{border-left:10px solid #d3d3d3;padding-left:3px}#answers,#backToTop,#sidebar .infobox{border:1px solid #ddd;box-shadow:0 0 5px #CCC}.torrent_result p{margin:3px;font-size:.8em}.torrent_result a{color:#084999}.torrent_result a:hover{text-decoration:underline}.torrent_result a:visited{color:#684898}#results{margin:2em 2em 20px;padding:0;width:50em}#suggestions .wrapper{display:flex;flex-flow:row wrap;justify-content:flex-end}#suggestions .wrapper form{display:inline-block;flex:1 1 50%}#answers,#corrections,#suggestions{max-width:50em}#answers input,#corrections input,#infoboxes input,#suggestions input{padding:0;margin:3px;font-size:.9em;display:inline-block;background:0 0;color:#444;cursor:pointer}#answers .infobox .url a,#answers input[type=submit],#corrections .infobox .url a,#corrections input[type=submit],#infoboxes .infobox .url a,#infoboxes input[type=submit],#suggestions .infobox .url a,#suggestions input[type=submit]{color:#084999;text-decoration:none;font-size:.9rem}#answers .infobox .url a:hover,#answers input[type=submit]:hover,#corrections .infobox .url a:hover,#corrections input[type=submit]:hover,#infoboxes .infobox .url a:hover,#infoboxes input[type=submit]:hover,#suggestions .infobox .url a:hover,#suggestions input[type=submit]:hover{text-decoration:underline}#corrections{display:flex;flex-flow:row wrap;margin:1em 0}#corrections h4,#corrections input[type=submit]{display:inline-block;margin:0 .5em 0 0}#corrections input[type=submit]::after{content:", "}#apis .title,#search_url .title,#suggestions .title{margin:2em 0 .5em;color:#444}#answers{margin:10px 8px;padding:.9em}#answers h4{display:none}#answers .answer{display:block;font-size:1.2em;font-weight:700}#answers form,#infoboxes form{min-width:210px}#sidebar{position:absolute;top:100px;left:57em;margin:0 2px 5px 5px;padding:0 2px 2px;max-width:25em;word-wrap:break-word}#sidebar .infobox{margin:10px 0;padding:.9em;font-size:.9em}#sidebar .infobox h2{margin:0 0 .5em}#sidebar .infobox img{max-width:100%;max-height:12em;display:block;margin:0;padding:0}#sidebar .infobox dl{margin:.5em 0}#sidebar .infobox dt{display:inline;margin:.5em .25em .5em 0;padding:0;font-weight:700}#sidebar .infobox dd{display:inline;margin:.5em 0;padding:0}#apis,#search_url{margin-top:8px}#sidebar .infobox input{font-size:1em}#search_url div.selectable_url pre{width:200em}#linkto_preferences{position:absolute;right:10px;top:.9em;padding:0;border:0;display:block;font-size:1.2em;color:#222}#linkto_preferences a:active *,#linkto_preferences a:hover *,#linkto_preferences a:link *,#linkto_preferences a:visited *{color:#222}#backToTop{margin:0 0 0 2em;padding:0;font-size:1em;background:#fff;position:fixed;bottom:85px;left:50em;transition:opacity .5s;opacity:0}#backToTop a{display:block;margin:0;padding:.6em}@media screen and (max-width:75em){#main_about,#main_preferences,#main_stats{margin:.5em;width:auto}#answers,#suggestions{margin-top:1em}#infoboxes{position:inherit;max-width:inherit}#infoboxes .infobox{clear:both}#infoboxes .infobox img{float:left;max-width:10em;margin:.5em .5em .5em 0}#sidebar{position:static;max-width:50em;margin:0 0 2px;padding:0;float:none;border:none;width:auto}.image_result,.image_result img,.result .thumbnail{max-width:98%}#sidebar input{border:0}#apis,#search_url{display:none}.result{border-bottom:1px solid #E8E7E6;margin:0;padding-top:8px;padding-bottom:6px}.result h3{margin:0 0 1px}.result .url span.url{display:block;white-space:nowrap;text-overflow:ellipsis;overflow:hidden;width:100%}.result .url a{float:right;padding:0 .5em}.result .engines{float:right;padding:0 0 3px}.result-images{border-bottom:none!important}}#main_results div#results.only_template_images{flex-direction:column;width:auto;display:flex}#main_results div#results.only_template_images #sidebar{position:relative;top:auto;order:2}#main_results div#results.only_template_images #urls{position:relative;order:1}#main_results div#results.only_template_images #backToTop{right:.5em;left:auto}#main_results div#results.only_template_images #pagination{position:relative;order:3}@media screen and (max-width:50em){article[data-vim-selected]::before{display:none;content:""}#linkto_preferences{display:none;postion:fixed!important;top:100px;right:0}#sidebar{margin:0 5px 2px}#corrections{margin:1em 5px}#results{margin:0;padding:0;width:initial}#backToTop{left:40em;bottom:35px}.result{padding:8px 10px 6px}.result-images{margin:0;padding:0;border:none}}@media screen and (max-width:35em){.result-videos img.thumbnail{float:none!important}.result-videos .content{overflow:inherit}}pre code{white-space:pre-wrap}
\ No newline at end of file
diff --git a/searx/static/themes/simple/js/searx.head.min.js b/searx/static/themes/simple/js/searx.head.min.js
index dd85086ee..043f25515 100644
--- a/searx/static/themes/simple/js/searx.head.min.js
+++ b/searx/static/themes/simple/js/searx.head.min.js
@@ -1,4 +1,4 @@
-/*! simple/searx.min.js | 23-03-2021 |  */
+/*! simple/searx.min.js | 21-04-2021 |  */
 
 (function(t,e){"use strict";var a=e.currentScript||function(){var t=e.getElementsByTagName("script");return t[t.length-1]}();t.searx={touch:"ontouchstart"in t||t.DocumentTouch&&document instanceof DocumentTouch||false,method:a.getAttribute("data-method"),autocompleter:a.getAttribute("data-autocompleter")==="true",search_on_category_select:a.getAttribute("data-search-on-category-select")==="true",infinite_scroll:a.getAttribute("data-infinite-scroll")==="true",static_path:a.getAttribute("data-static-path"),translations:JSON.parse(a.getAttribute("data-translations"))};e.getElementsByTagName("html")[0].className=t.searx.touch?"js touch":"js"})(window,document);
 //# sourceMappingURL=searx.head.min.js.map
\ No newline at end of file
diff --git a/searx/static/themes/simple/js/searx.min.js b/searx/static/themes/simple/js/searx.min.js
index 17daac2a4..8ae15bede 100644
--- a/searx/static/themes/simple/js/searx.min.js
+++ b/searx/static/themes/simple/js/searx.min.js
@@ -1,4 +1,4 @@
-/*! simple/searx.min.js | 23-03-2021 |  */
+/*! simple/searx.min.js | 21-04-2021 |  */
 
 window.searx=function(t,a){"use strict";if(t.Element){(function(e){e.matches=e.matches||e.matchesSelector||e.webkitMatchesSelector||e.msMatchesSelector||function(e){var t=this,n=(t.parentNode||t.document).querySelectorAll(e),i=-1;while(n[++i]&&n[i]!=t);return!!n[i]}})(Element.prototype)}function o(e,t,n){try{e.call(t,n)}catch(e){console.log(e)}}var s=window.searx||{};s.on=function(i,e,r,t){t=t||false;if(typeof i!=="string"){i.addEventListener(e,r,t)}else{a.addEventListener(e,function(e){var t=e.target||e.srcElement,n=false;while(t&&t.matches&&t!==a&&!(n=t.matches(i)))t=t.parentElement;if(n)o(r,t,e)},t)}};s.ready=function(e){if(document.readyState!="loading"){e.call(t)}else{t.addEventListener("DOMContentLoaded",e.bind(t))}};s.http=function(e,t,n){var i=new XMLHttpRequest,r=function(){},a=function(){},o={then:function(e){r=e;return o},catch:function(e){a=e;return o}};try{i.open(e,t,true);i.onload=function(){if(i.status==200){r(i.response,i.responseType)}else{a(Error(i.statusText))}};i.onerror=function(){a(Error("Network Error"))};i.onabort=function(){a(Error("Transaction is aborted"))};i.send()}catch(e){a(e)}return o};s.loadStyle=function(e){var t=s.static_path+e,n="style_"+e.replace(".","_"),i=a.getElementById(n);if(i===null){i=a.createElement("link");i.setAttribute("id",n);i.setAttribute("rel","stylesheet");i.setAttribute("type","text/css");i.setAttribute("href",t);a.body.appendChild(i)}};s.loadScript=function(e,t){var n=s.static_path+e,i="script_"+e.replace(".","_"),r=a.getElementById(i);if(r===null){r=a.createElement("script");r.setAttribute("id",i);r.setAttribute("src",n);r.onload=t;r.onerror=function(){r.setAttribute("error","1")};a.body.appendChild(r)}else if(!r.hasAttribute("error")){try{t.apply(r,[])}catch(e){console.log(e)}}else{console.log("callback not executed : script '"+n+"' not loaded.")}};s.insertBefore=function(e,t){element.parentNode.insertBefore(e,t)};s.insertAfter=function(e,t){t.parentNode.insertBefore(e,t.nextSibling)};s.on(".close","click",function(e){var t=e.target||e.srcElement;this.parentNode.classList.add("invisible")});return s}(window,document);(function(e){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=e()}else if(typeof define==="function"&&define.amd){define([],e)}else{var t;if(typeof window!=="undefined"){t=window}else if(typeof global!=="undefined"){t=global}else if(typeof self!=="undefined"){t=self}else{t=this}t.AutoComplete=e()}})(function(){var e,t,n;return function a(o,s,l){function u(n,e){if(!s[n]){if(!o[n]){var t=typeof require=="function"&&require;if(!e&&t)return t(n,!0);if(c)return c(n,!0);var i=new Error("Cannot find module '"+n+"'");throw i.code="MODULE_NOT_FOUND",i}var r=s[n]={exports:{}};o[n][0].call(r.exports,function(e){var t=o[n][1][e];return u(t?t:e)},r,r.exports,a,o,s,l)}return s[n].exports}var c=typeof require=="function"&&require;for(var e=0;e<l.length;e++)u(l[e]);return u}({1:[function(e,t,n){
 /*
diff --git a/searx/static/themes/simple/less/definitions.less b/searx/static/themes/simple/less/definitions.less
index 7a43720b8..c1465a579 100644
--- a/searx/static/themes/simple/less/definitions.less
+++ b/searx/static/themes/simple/less/definitions.less
@@ -19,6 +19,9 @@
 @color-warning: #dbba34;
 @color-warning-background: lighten(@color-warning, 40%);
 
+@color-success: #42db34;
+@color-success-background: lighten(@color-success, 40%);
+
 /// General
 
 @color-font: #444;
diff --git a/searx/static/themes/simple/less/preferences.less b/searx/static/themes/simple/less/preferences.less
index 26c4f6ddd..93bdaad27 100644
--- a/searx/static/themes/simple/less/preferences.less
+++ b/searx/static/themes/simple/less/preferences.less
@@ -105,9 +105,10 @@
     font-size: 14px;
     font-weight: normal;
     z-index: 1000000; 
+    text-align: left;
   }
 
-  th:hover .engine-tooltip, .engine-tooltip:hover {
+  th:hover .engine-tooltip, td:hover .engine-tooltip, .engine-tooltip:hover {
     display: inline-block;
   }
   
diff --git a/searx/static/themes/simple/less/style.less b/searx/static/themes/simple/less/style.less
index e00b2deff..55fb721c9 100644
--- a/searx/static/themes/simple/less/style.less
+++ b/searx/static/themes/simple/less/style.less
@@ -4,6 +4,8 @@
 * To convert "style.less" to "style.css" run: $make styles
 */
 
+@stacked-bar-chart: rgb(0, 0, 0);
+
 @import "normalize.less";
 
 @import "definitions.less";
diff --git a/searx/static/themes/simple/less/toolkit.less b/searx/static/themes/simple/less/toolkit.less
index 46ea17b3a..b3dba9ea9 100644
--- a/searx/static/themes/simple/less/toolkit.less
+++ b/searx/static/themes/simple/less/toolkit.less
@@ -36,6 +36,14 @@ html.js .show_if_nojs {
   background-color: @color-error-background;
 }
 
+.warning {
+  background: @color-warning-background;
+}
+
+.success {
+  background: @color-success-background;
+}
+
 .badge {
   display: inline-block;
   color: #fff;
@@ -465,4 +473,62 @@ select {
 	-webkit-transform: rotate(360deg);
 	transform: rotate(360deg);
     }
-}
\ No newline at end of file
+}
+
+/* -- stacked bar chart -- */
+.stacked-bar-chart {
+  margin: 0;
+  padding: 0 0.125rem 0 4rem;
+  width: 100%;
+  width: -moz-available;
+  width: -webkit-fill-available;
+  width: fill;
+  flex-direction: row;
+  flex-wrap: nowrap;
+  align-items: center;
+  display: inline-flex;
+}
+
+.stacked-bar-chart-value {
+  width: 3rem;
+  display: inline-block;
+  position: absolute;
+  padding: 0 0.5rem;
+  text-align: right;
+}
+
+.stacked-bar-chart-base {
+  display:flex;
+  flex-shrink: 0;
+  flex-grow: 0;
+  flex-basis: unset;
+}
+
+.stacked-bar-chart-median {
+  .stacked-bar-chart-base();
+  background: @stacked-bar-chart;
+  border: 1px solid fade(@stacked-bar-chart, 90%);
+  padding: 0.3rem 0;
+}
+
+.stacked-bar-chart-rate80 {
+  .stacked-bar-chart-base();
+  background: transparent;
+  border: 1px solid fade(@stacked-bar-chart, 30%);
+  padding: 0.3rem 0;
+}
+
+.stacked-bar-chart-rate95 {
+  .stacked-bar-chart-base();
+  background: transparent;
+  border-bottom: 1px dotted fade(@stacked-bar-chart, 50%);
+  padding: 0;
+}
+
+.stacked-bar-chart-rate100 {
+  .stacked-bar-chart-base();
+  background: transparent;
+  border-left: 1px solid fade(@stacked-bar-chart, 90%);
+  padding: 0.4rem 0;
+  width: 1px;
+}
diff --git a/searx/templates/oscar/macros.html b/searx/templates/oscar/macros.html
index 1cf46074f..0e9dc227a 100644
--- a/searx/templates/oscar/macros.html
+++ b/searx/templates/oscar/macros.html
@@ -134,13 +134,11 @@ custom-select{% if rtl %}-rtl{% endif %}
 {%- endmacro %}
 
 {% macro support_toggle(supports) -%}
-    {%- if supports -%}
-    <span class="label label-success">
-        {{- _("supported") -}}
-    </span>
+    {%- if supports == '?' -%}
+    <span class="glyphicon glyphicon-exclamation-sign" aria-hidden="true" title="{{- _('broken') -}}"></span>{{- "" -}}
+    {%- elif supports -%}
+    <span class="glyphicon glyphicon-ok" aria-hidden="true" title="{{- _('supported') -}}"></span>{{- "" -}}
     {%- else -%}
-    <span class="label label-danger">
-        {{- _("not supported") -}}
-    </span>
+    <span aria-hidden="true" title="{{- _('not supported') -}}"></span>{{- "" -}}
     {%- endif -%}
 {%- endmacro %}
diff --git a/searx/templates/oscar/preferences.html b/searx/templates/oscar/preferences.html
index 2602c19d9..e8cae1ca5 100644
--- a/searx/templates/oscar/preferences.html
+++ b/searx/templates/oscar/preferences.html
@@ -1,16 +1,74 @@
 {% from 'oscar/macros.html' import preferences_item_header, preferences_item_header_rtl, preferences_item_footer, preferences_item_footer_rtl, checkbox_toggle, support_toggle, custom_select_class %}
 {% extends "oscar/base.html" %}
-{% macro engine_about(search_engine, id) -%}
-{% if search_engine.about is defined %}
+{%- macro engine_about(search_engine, id) -%}
+{% if search_engine.about is defined or stats[search_engine.name]['result_count'] > 0 %}
 {% set about = search_engine.about %}
 <div class="engine-tooltip" role="tooltip" id="{{ id }}">{{- "" -}}
-    <h5><a href="{{about.website}}" rel="noreferrer">{{about.website}}</a></h5>
-    {%- if about.wikidata_id -%}<p><a href="https://www.wikidata.org/wiki/{{about.wikidata_id}}" rel="noreferrer">wikidata.org/wiki/{{about.wikidata_id}}</a></p>{%- endif -%}
+    {% if search_engine.about is defined %}
+        <h5><a href="{{about.website}}" rel="noreferrer">{{about.website}}</a></h5>
+        {%- if about.wikidata_id -%}<p><a href="https://www.wikidata.org/wiki/{{about.wikidata_id}}" rel="noreferrer">wikidata.org/wiki/{{about.wikidata_id}}</a></p>{%- endif -%}
+    {% endif %}
     {%- if search_engine.enable_http %}<p>{{ icon('exclamation-sign', 'No HTTPS') }}{{ _('No HTTPS')}}</p>{% endif -%}
+    {%- if stats[search_engine.name]['result_count'] -%}
+        <p>{{ _('Number of results') }}: {{ stats[search_engine.name]['result_count'] }} ( {{ _('Avg.') }} )</p>{{- "" -}}
+    {%- endif -%}
 </div>
 {%- endif -%}
 {%- endmacro %}
-{% block title %}{{ _('preferences') }} - {% endblock %}
+
+{%- macro engine_time(engine_name, css_align_class) -%}
+<td class="{{ label }}" style="padding: 2px">{{- "" -}}
+    {%- if stats[engine_name].time != None -%}
+    <span class="stacked-bar-chart-value">{{- stats[engine_name].time -}}</span>{{- "" -}}
+    <span class="stacked-bar-chart" aria-labelledby="{{engine_name}}_chart" aria-hidden="true">{{- "" -}}
+        <span style="width: calc(max(2px, 100%*{{ (stats[engine_name].time / max_rate95)|round(3) }}))" class="stacked-bar-chart-median"></span>{{- "" -}}
+        <span style="width: calc(100%*{{ ((stats[engine_name].rate80 - stats[engine_name].time) / max_rate95)|round(3) }})" class="stacked-bar-chart-rate80"></span>{{- "" -}}
+        <span style="width: calc(100%*{{ ((stats[engine_name].rate95 - stats[engine_name].rate80) / max_rate95)|round(3) }})" class="stacked-bar-chart-rate95"></span>{{- "" -}}
+        <span class="stacked-bar-chart-rate100"></span>{{- "" -}}
+    </span>{{- "" -}}
+    <div class="engine-tooltip text-left" role="tooltip" id="{{engine_name}}_graph">{{- "" -}}
+        <p>{{ _('Median') }}: {{ stats[engine_name].time }}</p>{{- "" -}}
+        <p>{{ _('P80') }}: {{ stats[engine_name].rate80 }}</p>{{- "" -}}
+        <p>{{ _('P95') }}: {{ stats[engine_name].rate95 }}</p>{{- "" -}}
+    </div>
+    {%- endif -%}
+</td>
+{%- endmacro -%}
+
+{%- macro engine_reliability(engine_name, css_align_class) -%}
+{% set r = reliabilities.get(engine_name, {}).get('reliablity', None) %}
+{% set checker_result = reliabilities.get(engine_name, {}).get('checker', []) %}
+{% set errors = reliabilities.get(engine_name, {}).get('errors', []) %}
+{% if r != None %}
+    {% if r <= 50 %}{% set label = 'danger' %}
+    {% elif r < 80 %}{% set label = 'warning' %}
+    {% elif r < 90 %}{% set label = 'default' %}
+    {% else %}{% set label = 'success' %}
+    {% endif %}
+{% else %}
+    {% set r = '' %}
+{% endif %}
+{% if checker_result or errors %}
+<td class="{{ css_align_class }} {{ label }}">{{- "" -}}
+    <span aria-labelledby="{{engine_name}}_reliablity">
+        {%- if reliabilities[engine_name].checker %}{{ icon('exclamation-sign', 'The checker fails on the some tests') }}{% endif %} {{ r -}}
+    </span>{{- "" -}}
+    <div class="engine-tooltip text-left" role="tooltip" id="{{engine_name}}_reliablity">
+        {%- if checker_result -%}
+        <p>{{ _("Failed checker test(s): ") }} {{ ', '.join(checker_result) }}</p>
+        {%- endif -%}
+        {%- for error in errors -%}
+        <p>{{ error }} </p>{{- "" -}}
+        {%- endfor -%}
+    </div>{{- "" -}}
+</td>
+{%- else -%}
+<td class="{{ css_align_class }} {{ label }}"><span>{{ r }}</span></td>
+{%- endif -%}
+{%- endmacro -%}
+
+{%- block title %}{{ _('preferences') }} - {% endblock -%}
+
 {% block content %}
 
 <div>
@@ -182,7 +240,6 @@
                 </fieldset>
             </div>
             <div class="tab-pane active_if_nojs" id="tab_engine">
-
                 <!-- Nav tabs -->
                 <ul class="nav nav-tabs nav-justified hide_if_nojs" role="tablist">
                     {% for categ in all_categories %}
@@ -217,14 +274,16 @@
                                     <th scope="col">{{ _("Allow") }}</th>
                                     <th scope="col">{{ _("Engine name") }}</th>
                                     <th scope="col">{{ _("Shortcut") }}</th>
-                                    <th scope="col">{{ _("Selected language") }}</th>
-                                    <th scope="col">{{ _("SafeSearch") }}</th>
-                                    <th scope="col">{{ _("Time range") }}</th>
-                                    <th scope="col">{{ _("Avg. time") }}</th>
-                                    <th scope="col">{{ _("Max time") }}</th>
+                                    <th scope="col" style="width: 10rem">{{ _("Selected language") }}</th>
+                                    <th scope="col" style="width: 10rem">{{ _("SafeSearch") }}</th>
+                                    <th scope="col" style="width: 10rem">{{ _("Time range") }}</th>
+                                    <th scope="col">{{ _("Response time") }}</th>
+                                    <th scope="col" class="text-right"  style="width: 7rem">{{ _("Max time") }}</th>
+                                    <th scope="col" class="text-right" style="width: 7rem">{{ _("Reliablity") }}</th>
                                     {% else %}
-                                    <th scope="col" class="text-right">{{ _("Max time") }}</th>
-                                    <th scope="col" class="text-right">{{ _("Avg. time") }}</th>
+                                    <th scope="col">{{ _("Reliablity") }}</th>
+                                    <th scope="col">{{ _("Max time") }}</th>
+                                    <th scope="col" class="text-right">{{ _("Response time") }}</th>
                                     <th scope="col" class="text-right">{{ _("Time range") }}</th>
                                     <th scope="col" class="text-right">{{ _("SafeSearch") }}</th>
                                     <th scope="col" class="text-right">{{ _("Selected language") }}</th>
@@ -246,17 +305,19 @@
                                             {{- engine_about(search_engine, 'tooltip_' + categ + '_' + search_engine.name) -}}
                                         </th>
                                         <td class="name">{{ shortcuts[search_engine.name] }}</td>
-                                        <td>{{ support_toggle(stats[search_engine.name].supports_selected_language) }}</td>
-                                        <td>{{ support_toggle(search_engine.safesearch==True) }}</td>
-                                        <td>{{ support_toggle(search_engine.time_range_support==True) }}</td>
-                                        <td class="{{ 'danger' if stats[search_engine.name]['warn_time'] else '' }}">{% if stats[search_engine.name]['warn_time'] %}{{ icon('exclamation-sign')}} {% endif %}{{ 'N/A' if stats[search_engine.name].time==None else stats[search_engine.name].time }}</td>
-                                        <td class="{{ 'danger' if stats[search_engine.name]['warn_timeout'] else '' }}">{% if stats[search_engine.name]['warn_timeout'] %}{{ icon('exclamation-sign') }} {% endif %}{{ search_engine.timeout }}</td>
+                                        <td>{{ support_toggle(supports[search_engine.name]['supports_selected_language']) }}</td>
+                                        <td>{{ support_toggle(supports[search_engine.name]['safesearch']) }}</td>
+                                        <td>{{ support_toggle(supports[search_engine.name]['time_range_support']) }}</td>
+                                        {{ engine_time(search_engine.name, 'text-right') }}
+                                        <td class="text-right {{ 'danger' if stats[search_engine.name]['warn_timeout'] else '' }}">{% if stats[search_engine.name]['warn_timeout'] %}{{ icon('exclamation-sign') }} {% endif %}{{ search_engine.timeout }}</td>
+                                        {{ engine_reliability(search_engine.name, 'text-right ') }}
                                     {% else %}
-                                        <td class="{{ 'danger' if stats[search_engine.name]['warn_timeout'] else '' }}">{{ search_engine.timeout }}{% if stats[search_engine.name]['warn_time'] %} {{ icon('exclamation-sign')}}{% endif %}</td>
-                                        <td class="{{ 'danger' if stats[search_engine.name]['warn_time'] else '' }}">{{ 'N/A' if stats[search_engine.name].time==None else stats[search_engine.name].time }}{% if stats[search_engine.name]['warn_time'] %} {{ icon('exclamation-sign')}}{% endif %}</td>
-                                        <td>{{ support_toggle(search_engine.time_range_support==True) }}</td>
-                                        <td>{{ support_toggle(search_engine.safesearch==True) }}</td>
-                                        <td>{{ support_toggle(stats[search_engine.name].supports_selected_language) }}</td>
+                                        {{ engine_reliability(search_engine.name, 'text-left') }}
+                                        <td class="text-left {{ 'danger' if stats[search_engine.name]['warn_timeout'] else '' }}">{{ search_engine.timeout }}{% if stats[search_engine.name]['warn_time'] %} {{ icon('exclamation-sign')}}{% endif %}</td>
+                                        {{ engine_time(search_engine.name, 'text-left') }}
+                                        <td>{{ support_toggle(supports[search_engine.name]['time_range_support']) }}</td>
+                                        <td>{{ support_toggle(supports[search_engine.name]['safesearch']) }}</td>
+                                        <td>{{ support_toggle(supports[search_engine.name]['supports_selected_language']) }}</td>
                                         <td>{{ shortcuts[search_engine.name] }}</td>
                                         <th scope="row"><span>{% if search_engine.enable_http %}{{ icon('exclamation-sign', 'No HTTPS') }}{% endif %}{{ search_engine.name }}</span>{{ engine_about(search_engine) }}</th>
                                         <td class="onoff-checkbox">
diff --git a/searx/templates/oscar/stats.html b/searx/templates/oscar/stats.html
index 0fb104210..0573bf65f 100644
--- a/searx/templates/oscar/stats.html
+++ b/searx/templates/oscar/stats.html
@@ -1,4 +1,16 @@
 {% extends "oscar/base.html" %}
+{% block styles %}
+    <link rel="stylesheet" href="{{ url_for('static', filename='css/charts.min.css') }}" type="text/css" />
+    <style>
+        #engine-times {
+          --labels-size: 20rem;
+        }
+
+        #engine-times th {
+            text-align: right;
+        }
+    </style>
+{% endblock %}
 {% block title %}{{ _('stats') }} - {% endblock %}
 {% block content %}
 <div class="container-fluid">
diff --git a/searx/templates/simple/macros.html b/searx/templates/simple/macros.html
index 1eb42667a..8b6851e0e 100644
--- a/searx/templates/simple/macros.html
+++ b/searx/templates/simple/macros.html
@@ -79,7 +79,11 @@
 
 {%- macro checkbox(name, checked, readonly, disabled) -%}
 <div class="checkbox">{{- '' -}}
-    <input type="checkbox" value="None" id="{{ name }}" name="{{ name }}" {% if checked %}checked{% endif %}{% if readonly %} readonly="readonly" {% endif %}{% if disabled %} disabled="disabled" {% endif %}/>{{- '' -}}
-    <label for="{{ name }}"></label>{{- '' -}}
+    {%- if checked == '?' -%}
+      {{ icon_small('warning') }}
+    {%- else -%}
+      <input type="checkbox" value="None" id="{{ name }}" name="{{ name }}" {% if checked %}checked{% endif %}{% if readonly %} readonly="readonly" {% endif %}{% if disabled %} disabled="disabled" {% endif %}/>{{- '' -}}
+      <label for="{{ name }}"></label>{{- '' -}}
+    {%- endif -%}
 </div>
 {%- endmacro -%}
diff --git a/searx/templates/simple/preferences.html b/searx/templates/simple/preferences.html
index 504610c6d..c7c379618 100644
--- a/searx/templates/simple/preferences.html
+++ b/searx/templates/simple/preferences.html
@@ -29,6 +29,58 @@
 {%- endif -%}
 {%- endmacro %}
 
+{%- macro engine_time(engine_name) -%}
+<td class="{{ label }}" style="padding: 2px; width: 13rem;">{{- "" -}}
+    {%- if stats[engine_name].time != None -%}
+    <span class="stacked-bar-chart-value">{{- stats[engine_name].time -}}</span>{{- "" -}}
+    <span class="stacked-bar-chart" aria-labelledby="{{engine_name}}_chart" aria-hidden="true">{{- "" -}}
+        <span style="width: calc(max(2px, 100%*{{ (stats[engine_name].time / max_rate95)|round(3) }}))" class="stacked-bar-chart-median"></span>{{- "" -}}
+        <span style="width: calc(100%*{{ ((stats[engine_name].rate80 - stats[engine_name].time) / max_rate95)|round(3) }})" class="stacked-bar-chart-rate80"></span>{{- "" -}}
+        <span style="width: calc(100%*{{ ((stats[engine_name].rate95 - stats[engine_name].rate80) / max_rate95)|round(3) }})" class="stacked-bar-chart-rate95"></span>{{- "" -}}
+        <span class="stacked-bar-chart-rate100"></span>{{- "" -}}
+    </span>{{- "" -}}
+    <div class="engine-tooltip text-left" role="tooltip" id="{{engine_name}}_graph">{{- "" -}}
+        <p>{{ _('Median') }}: {{ stats[engine_name].time }}</p>{{- "" -}}
+        <p>{{ _('P80') }}: {{ stats[engine_name].rate80 }}</p>{{- "" -}}
+        <p>{{ _('P95') }}: {{ stats[engine_name].rate95 }}</p>{{- "" -}}
+    </div>
+    {%- endif -%}
+</td>
+{%- endmacro -%}
+
+{%- macro engine_reliability(engine_name) -%}
+{% set r = reliabilities.get(engine_name, {}).get('reliablity', None) %}
+{% set checker_result = reliabilities.get(engine_name, {}).get('checker', []) %}
+{% set errors = reliabilities.get(engine_name, {}).get('errors', []) %}
+{% if r != None %}
+    {% if r <= 50 %}{% set label = 'danger' %}
+    {% elif r < 80 %}{% set label = 'warning' %}
+    {% elif r < 90 %}{% set label = '' %}
+    {% else %}{% set label = 'success' %}
+    {% endif %}
+{% else %}
+    {% set r = '' %}
+{% endif %}
+{% if checker_result or errors %}
+<td class="{{ label }}">{{- "" -}}
+    <span aria-labelledby="{{engine_name}}_reliablity">
+        {%- if reliabilities[engine_name].checker %}{{ icon('warning', 'The checker fails on the some tests') }}{% endif %} {{ r -}}
+    </span>{{- "" -}}
+    <div class="engine-tooltip" style="right: 12rem;" role="tooltip" id="{{engine_name}}_reliablity">
+        {%- if checker_result -%}
+        <p>{{ _("The checker fails on this tests: ") }} {{ ', '.join(checker_result) }}</p>
+        {%- endif -%}
+        {%- if errors %}<p>{{ _('Errors:') }}</p>{% endif -%}
+        {%- for error in errors -%}
+        <p>{{ error }} </p>{{- "" -}}
+        {%- endfor -%}
+    </div>{{- "" -}}
+</td>
+{%- else -%}
+<td class="{{ css_align_class }} {{ label }}"><span>{{ r }}</span></td>
+{%- endif -%}
+{%- endmacro -%}
+
 {% block head %} {% endblock %}
 {% block content %}
 
@@ -123,8 +175,9 @@
         <th>{{ _("Supports selected language") }}</th>
         <th>{{ _("SafeSearch") }}</th>
         <th>{{ _("Time range") }}</th>
-        <th>{{ _("Avg. time") }}</th>
+        <th>{{ _("Response time") }}</th>
         <th>{{ _("Max time") }}</th>
+        <th>{{ _("Reliablity") }}</th>
       </tr>
       {% for search_engine in engines_by_category[categ] %}
 
@@ -134,11 +187,12 @@
         <td class="engine_checkbox">{{ checkbox_onoff(engine_id, (search_engine.name, categ) in disabled_engines) }}</td>
         <th class="name">{% if search_engine.enable_http %}{{ icon('warning', 'No HTTPS') }}{% endif %} {{ search_engine.name }} {{ engine_about(search_engine) }}</th>
         <td class="shortcut">{{ shortcuts[search_engine.name] }}</td>
-        <td>{{ checkbox(engine_id + '_supported_languages', current_language == 'all' or current_language in search_engine.supported_languages or current_language.split('-')[0] in search_engine.supported_languages, true, true) }}</td>
-        <td>{{ checkbox(engine_id + '_safesearch', search_engine.safesearch==True, true, true) }}</td>
-        <td>{{ checkbox(engine_id + '_time_range_support', search_engine.time_range_support==True, true, true) }}</td>
-        <td class="{{ 'danger' if stats[search_engine.name]['warn_time'] else '' }}">{{ 'N/A' if stats[search_engine.name].time==None else stats[search_engine.name].time }}</td>
+        <td>{{ checkbox(engine_id + '_supported_languages', supports[search_engine.name]['supports_selected_language'], true, true) }}</td>
+        <td>{{ checkbox(engine_id + '_safesearch', supports[search_engine.name]['safesearch'], true, true) }}</td>
+        <td>{{ checkbox(engine_id + '_time_range_support', supports[search_engine.name]['time_range_support'], true, true) }}</td>
+        {{ engine_time(search_engine.name) }}
         <td class="{{ 'danger' if stats[search_engine.name]['warn_timeout'] else '' }}">{{ search_engine.timeout }}</td>
+        {{ engine_reliability(search_engine.name) }}
       </tr>
       {% endif %}
       {% endfor %}
diff --git a/searx/webapp.py b/searx/webapp.py
index c3cd38ae8..d02e142fc 100755
--- a/searx/webapp.py
+++ b/searx/webapp.py
@@ -51,7 +51,7 @@ from searx import logger
 logger = logger.getChild('webapp')
 
 from datetime import datetime, timedelta
-from time import time
+from timeit import default_timer
 from html import escape
 from io import StringIO
 from urllib.parse import urlencode, urlparse
@@ -73,9 +73,7 @@ from flask.json import jsonify
 from searx import brand, static_path
 from searx import settings, searx_dir, searx_debug
 from searx.exceptions import SearxParameterException
-from searx.engines import (
-    categories, engines, engine_shortcuts, get_engines_stats
-)
+from searx.engines import categories, engines, engine_shortcuts
 from searx.webutils import (
     UnicodeWriter, highlight_content, get_resources_directory,
     get_static_files, get_result_templates, get_themes,
@@ -95,7 +93,7 @@ from searx.preferences import Preferences, ValidationException, LANGUAGE_CODES
 from searx.answerers import answerers
 from searx.network import stream as http_stream
 from searx.answerers import ask
-from searx.metrology.error_recorder import errors_per_engines
+from searx.metrics import get_engines_stats, get_engine_errors, histogram, counter
 
 # serve pages with HTTP/1.1
 from werkzeug.serving import WSGIRequestHandler
@@ -172,6 +170,31 @@ _category_names = (gettext('files'),
                    gettext('onions'),
                    gettext('science'))
 
+#
+exception_classname_to_label = {
+    "searx.exceptions.SearxEngineCaptchaException": gettext("CAPTCHA"),
+    "searx.exceptions.SearxEngineTooManyRequestsException": gettext("too many requests"),
+    "searx.exceptions.SearxEngineAccessDeniedException": gettext("access denied"),
+    "searx.exceptions.SearxEngineAPIException": gettext("server API error"),
+    "httpx.TimeoutException": gettext("HTTP timeout"),
+    "httpx.ConnectTimeout": gettext("HTTP timeout"),
+    "httpx.ReadTimeout": gettext("HTTP timeout"),
+    "httpx.WriteTimeout": gettext("HTTP timeout"),
+    "httpx.HTTPStatusError": gettext("HTTP error"),
+    "httpx.ConnectError": gettext("HTTP connection error"),
+    "httpx.RemoteProtocolError": gettext("HTTP protocol error"),
+    "httpx.LocalProtocolError": gettext("HTTP protocol error"),
+    "httpx.ProtocolError": gettext("HTTP protocol error"),
+    "httpx.ReadError": gettext("network error"),
+    "httpx.WriteError": gettext("network error"),
+    "httpx.ProxyError": gettext("proxy error"),
+    "searx.exceptions.SearxEngineXPathException": gettext("parsing error"),
+    "KeyError": gettext("parsing error"),
+    "json.decoder.JSONDecodeError": gettext("parsing error"),
+    "lxml.etree.ParserError": gettext("parsing error"),
+    None: gettext("unexpected crash"),
+}
+
 _flask_babel_get_translations = flask_babel.get_translations
 
 
@@ -463,7 +486,7 @@ def _get_ordered_categories():
 
 @app.before_request
 def pre_request():
-    request.start_time = time()
+    request.start_time = default_timer()
     request.timings = []
     request.errors = []
 
@@ -521,7 +544,7 @@ def add_default_headers(response):
 
 @app.after_request
 def post_request(response):
-    total_time = time() - request.start_time
+    total_time = default_timer() - request.start_time
     timings_all = ['total;dur=' + str(round(total_time * 1000, 3))]
     if len(request.timings) > 0:
         timings = sorted(request.timings, key=lambda v: v['total'])
@@ -764,6 +787,8 @@ def __get_translated_errors(unresponsive_engines):
         error_msg = gettext(unresponsive_engine[1])
         if unresponsive_engine[2]:
             error_msg = "{} {}".format(error_msg, unresponsive_engine[2])
+        if unresponsive_engine[3]:
+            error_msg = gettext('Suspended') + ': ' + error_msg
         translated_errors.add((unresponsive_engine[0], error_msg))
     return translated_errors
 
@@ -850,35 +875,106 @@ def preferences():
     allowed_plugins = request.preferences.plugins.get_enabled()
 
     # stats for preferences page
-    stats = {}
+    filtered_engines = dict(filter(lambda kv: (kv[0], request.preferences.validate_token(kv[1])), engines.items()))
 
     engines_by_category = {}
     for c in categories:
-        engines_by_category[c] = []
-        for e in categories[c]:
-            if not request.preferences.validate_token(e):
-                continue
-
-            stats[e.name] = {'time': None,
-                             'warn_timeout': False,
-                             'warn_time': False}
-            if e.timeout > settings['outgoing']['request_timeout']:
-                stats[e.name]['warn_timeout'] = True
-            stats[e.name]['supports_selected_language'] = _is_selected_language_supported(e, request.preferences)
-            engines_by_category[c].append(e)
+        engines_by_category[c] = [e for e in categories[c] if e.name in filtered_engines]
+        # sort the engines alphabetically since the order in settings.yml is meaningless.
+        list.sort(engines_by_category[c], key=lambda e: e.name)
 
     # get first element [0], the engine time,
     # and then the second element [1] : the time (the first one is the label)
-    for engine_stat in get_engines_stats(request.preferences)[0][1]:
-        stats[engine_stat.get('name')]['time'] = round(engine_stat.get('avg'), 3)
-        if engine_stat.get('avg') > settings['outgoing']['request_timeout']:
-            stats[engine_stat.get('name')]['warn_time'] = True
+    stats = {}
+    max_rate95 = 0
+    for _, e in filtered_engines.items():
+        h = histogram('engine', e.name, 'time', 'total')
+        median = round(h.percentage(50), 1) if h.count > 0 else None
+        rate80 = round(h.percentage(80), 1) if h.count > 0 else None
+        rate95 = round(h.percentage(95), 1) if h.count > 0 else None
+
+        max_rate95 = max(max_rate95, rate95 or 0)
+
+        result_count_sum = histogram('engine', e.name, 'result', 'count').sum
+        successful_count = counter('engine', e.name, 'search', 'count', 'successful')
+        result_count = int(result_count_sum / float(successful_count)) if successful_count else 0
+
+        stats[e.name] = {
+            'time': median if median else None,
+            'rate80': rate80 if rate80 else None,
+            'rate95': rate95 if rate95 else None,
+            'warn_timeout': e.timeout > settings['outgoing']['request_timeout'],
+            'supports_selected_language': _is_selected_language_supported(e, request.preferences),
+            'result_count': result_count,
+        }
     # end of stats
 
+    # reliabilities
+    reliabilities = {}
+    engine_errors = get_engine_errors(filtered_engines)
+    checker_results = checker_get_result()
+    checker_results = checker_results['engines'] \
+        if checker_results['status'] == 'ok' and 'engines' in checker_results else {}
+    for _, e in filtered_engines.items():
+        checker_result = checker_results.get(e.name, {})
+        checker_success = checker_result.get('success', True)
+        errors = engine_errors.get(e.name) or []
+        if counter('engine', e.name, 'search', 'count', 'sent') == 0:
+            # no request
+            reliablity = None
+        elif checker_success and not errors:
+            reliablity = 100
+        elif 'simple' in checker_result.get('errors', {}):
+            # the basic (simple) test doesn't work: the engine is broken accoding to the checker
+            # even if there is no exception
+            reliablity = 0
+        else:
+            reliablity = 100 - sum([error['percentage'] for error in errors if not error.get('secondary')])
+
+        reliabilities[e.name] = {
+            'reliablity': reliablity,
+            'errors': [],
+            'checker': checker_results.get(e.name, {}).get('errors', {}).keys(),
+        }
+        # keep the order of the list checker_results[e.name]['errors'] and deduplicate.
+        # the first element has the highest percentage rate.
+        reliabilities_errors = []
+        for error in errors:
+            error_user_message = None
+            if error.get('secondary') or 'exception_classname' not in error:
+                continue
+            error_user_message = exception_classname_to_label.get(error.get('exception_classname'))
+            if not error:
+                error_user_message = exception_classname_to_label[None]
+            if error_user_message not in reliabilities_errors:
+                reliabilities_errors.append(error_user_message)
+        reliabilities[e.name]['errors'] = reliabilities_errors
+
+    # supports
+    supports = {}
+    for _, e in filtered_engines.items():
+        supports_selected_language = _is_selected_language_supported(e, request.preferences)
+        safesearch = e.safesearch
+        time_range_support = e.time_range_support
+        for checker_test_name in checker_results.get(e.name, {}).get('errors', {}):
+            if supports_selected_language and checker_test_name.startswith('lang_'):
+                supports_selected_language = '?'
+            elif safesearch and checker_test_name == 'safesearch':
+                safesearch = '?'
+            elif time_range_support and checker_test_name == 'time_range':
+                time_range_support = '?'
+        supports[e.name] = {
+            'supports_selected_language': supports_selected_language,
+            'safesearch': safesearch,
+            'time_range_support': time_range_support,
+        }
+
+    #
     locked_preferences = list()
     if 'preferences' in settings and 'lock' in settings['preferences']:
         locked_preferences = settings['preferences']['lock']
 
+    #
     return render('preferences.html',
                   selected_categories=get_selected_categories(request.preferences, request.form),
                   all_categories=_get_ordered_categories(),
@@ -887,6 +983,9 @@ def preferences():
                   image_proxy=image_proxy,
                   engines_by_category=engines_by_category,
                   stats=stats,
+                  max_rate95=max_rate95,
+                  reliabilities=reliabilities,
+                  supports=supports,
                   answerers=[{'info': a.self_info(), 'keywords': a.keywords} for a in answerers],
                   disabled_engines=disabled_engines,
                   autocomplete_backends=autocomplete_backends,
@@ -974,38 +1073,23 @@ def image_proxy():
 @app.route('/stats', methods=['GET'])
 def stats():
     """Render engine statistics page."""
-    stats = get_engines_stats(request.preferences)
+    filtered_engines = dict(filter(lambda kv: (kv[0], request.preferences.validate_token(kv[1])), engines.items()))
+    engine_stats = get_engines_stats(filtered_engines)
     return render(
         'stats.html',
-        stats=stats,
+        stats=[(gettext('Engine time (sec)'), engine_stats['time_total']),
+               (gettext('Page loads (sec)'), engine_stats['time_http']),
+               (gettext('Number of results'), engine_stats['result_count']),
+               (gettext('Scores'), engine_stats['scores']),
+               (gettext('Scores per result'), engine_stats['scores_per_result']),
+               (gettext('Errors'), engine_stats['error_count'])]
     )
 
 
 @app.route('/stats/errors', methods=['GET'])
 def stats_errors():
-    result = {}
-    engine_names = list(errors_per_engines.keys())
-    engine_names.sort()
-    for engine_name in engine_names:
-        error_stats = errors_per_engines[engine_name]
-        sent_search_count = max(engines[engine_name].stats['sent_search_count'], 1)
-        sorted_context_count_list = sorted(error_stats.items(), key=lambda context_count: context_count[1])
-        r = []
-        percentage_sum = 0
-        for context, count in sorted_context_count_list:
-            percentage = round(20 * count / sent_search_count) * 5
-            percentage_sum += percentage
-            r.append({
-                'filename': context.filename,
-                'function': context.function,
-                'line_no': context.line_no,
-                'code': context.code,
-                'exception_classname': context.exception_classname,
-                'log_message': context.log_message,
-                'log_parameters': context.log_parameters,
-                'percentage': percentage,
-            })
-        result[engine_name] = sorted(r, reverse=True, key=lambda d: d['percentage'])
+    filtered_engines = dict(filter(lambda kv: (kv[0], request.preferences.validate_token(kv[1])), engines.items()))
+    result = get_engine_errors(filtered_engines)
     return jsonify(result)