Performance issues : slow javascript and controller on import and positions refresh

Im using phonetrack with nextcloud (from 12, now 13). When I open phonetrack nextcloud app, its saying loading possitions. And hang ( froze). Click to page icons not working, nothing till possitions are loaded and map shown. Can it be, that it is nginx config issue? Can you help me (some settings that can help)? On desktop there isnt visible problem - no froze. Mobile - chrome android.