Fixes #5121 add New config setting to disable segment auto complete

config/global.ini.php

@@ -154,6 +154,10 @@ browser_archiving_disabled_enforce = 0
 ;       this will only affect custom segments added or modified after this setting is changed.
 enable_create_realtime_segments = 1
 
+; Whether to enable the "Suggest values for segment" in the Segment Editor panel.
+; Set this to 0 in case your Piwik database is very big, and suggested values may not appear in time
+enable_segment_suggested_values = 1
+
 ; this action name is used when the URL ends with a slash /
 ; it is useful to have an actual string to write in the UI
 action_default_name = index

plugins/API/API.php

@@ -570,6 +570,9 @@ class API extends \Piwik\Plugin\API
      */
     public function getSuggestedValuesForSegment($segmentName, $idSite)
     {
+        if(empty(Config::getInstance()->General['enable_segment_suggested_values'])) {
+            return array();
+        }
         Piwik::checkUserHasViewAccess($idSite);
 
         $maxSuggestionsToReturn = 30;