Related Lists may take a long time to Load if List V3 is enabledDescriptionRelated Lists may load very slowly on every form such as Incident, Change , Problem etc. The glide.ui.related_list_timing was set to ondemand under User Administation > User Preferences. However that did not take effect. Filter Conditions such as Active is True was also added to the Related Lists, however that did not seem to take effect as well. Release or EnvironmentALLCauseCustomer had enabled List v3 and hence the User preference AND Filter Conditions both did not take any effect. List v3 is disabled for related lists by default. https://<<instance_name>>.service-now.com/nav_to.do?uri=%2Fsystem_properties_ui.do%3Fsysparm_title%3DList%2520v3%2520Properties%26sysparm_category%3DList%2520v3%2520Properties This is explained in the ServiceNow documentation: Configure when a related list loads When List v3 is enabled for related lists, all related lists load asynchronously after the form loads, even if there are no v3 related lists on the form.ResolutionPlease disable List V3. List V3 can be disabled by unchecking the Enable List v3 for Related Lists on Forms under System Properties => List V3 (refer to screen above)Once List V3 is disabled, you can set related lists to 'ondemand' or 'deferred' for All Users as follows: Navigate to User Administration > User Preferences and create the following: Name: glide.ui.related_list_timingValue: ondemandUser: (leave this blank to set the property for all users)System: True Reference: https://docs.servicenow.com/csh?topicname=t_ConfigureWhenARelatedListLoads.html&version=latest This functionality applies only when List v3 is disabled for related lists, which is the default setting. You can also add Filter Conditions to your lists such as 'Active is True' if needed to improve the performance. NOTE: As always, please test any changes on a Sub Prod instance and then apply to PROD instance. Additional InformationGood practices to improve instance performance through Rowcount, Related Lists and Dashboards (KB0750152)List V2 and V3 side by side comparison