For this issue, use the google site speed tool: https://developers.google.com/speed/pagespeed/insights/
Run it with a collection or search URL.
Wait for the diagnostics to end and look at the results under ‘Reduce unused JavaScript’.
Check what apps running on this section and delay their load or remove them from being used in collection pages to improve the speed - you will need development resources for that.
Check for Mobile results and do the same as before.
