Not 100% sure but it seems playing games sometimes has a huge impact on device performance afterwards. Force killing the game helps so something is broken when it comes to pausing games/apps when they're in the background. Before Android 10 things be...
I'm also experiencing performance issues after the Android 10 update. It's fine just after boot but after a day or two turning on the screen, fingerprint unlock and app switching is slow or unresponsive. Lots of stuttering as well.
It would be nice if Asus would provide a list of unnecessary hidden apps that can be safely disabled to protect your privacy and possibly improve performance/battery life.