diff --git a/searx/network/__init__.py b/searx/network/__init__.py
index 981b2261a..587198144 100644
--- a/searx/network/__init__.py
+++ b/searx/network/__init__.py
@@ -44,7 +44,8 @@ def reset_time_for_thread():
 
 
 def get_time_for_thread():
-    return THREADLOCAL.total_time
+    """returns thread's total time or None"""
+    return THREADLOCAL.__dict__.get('total_time')
 
 
 def set_timeout_for_thread(timeout, start_time=None):
@@ -57,10 +58,11 @@ def set_context_network_name(network_name):
 
 
 def get_context_network():
-    try:
-        return THREADLOCAL.network
-    except AttributeError:
-        return get_network()
+    """If set return thread's network.
+
+    If unset, return value from :py:obj:`get_network`.
+    """
+    return THREADLOCAL.__dict__.get('network') or get_network()
 
 
 def request(method, url, **kwargs):
diff --git a/searx/results.py b/searx/results.py
index a1c1d8527..d0cb4df3f 100644
--- a/searx/results.py
+++ b/searx/results.py
@@ -371,11 +371,12 @@ class ResultContainer:
             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({
+        timing = {
             'engine': engines[engine_name].shortcut,
             'total': engine_time,
-            'load': page_load_time
-        })
+            'load': page_load_time,
+        }
+        self.timings.append(timing)
 
     def get_timings(self):
         return self.timings
diff --git a/searx/webapp.py b/searx/webapp.py
index 0ea82d098..7df12af18 100755
--- a/searx/webapp.py
+++ b/searx/webapp.py
@@ -568,7 +568,7 @@ def post_request(response):
         timings_total = ['total_' + str(i) + '_' + v['engine'] +
                          ';dur=' + str(round(v['total'] * 1000, 3)) for i, v in enumerate(timings)]
         timings_load = ['load_' + str(i) + '_' + v['engine'] +
-                        ';dur=' + str(round(v['load'] * 1000, 3)) for i, v in enumerate(timings)]
+                        ';dur=' + str(round(v['load'] * 1000, 3)) for i, v in enumerate(timings) if v.get('load')]
         timings_all = timings_all + timings_total + timings_load
     response.headers.add('Server-Timing', ', '.join(timings_all))
     return response
@@ -923,9 +923,9 @@ def preferences():
         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,
+            'time': median,
+            'rate80': rate80,
+            'rate95': rate95,
             'warn_timeout': e.timeout > settings['outgoing']['request_timeout'],
             'supports_selected_language': _is_selected_language_supported(e, request.preferences),
             'result_count': result_count,