I have the same problem. Im from Spain and i have my Iphone 12 pro since the first day. This day i tried to play Clash Royale and it was really dissappointing. It suffered laggin, freezing... a disaster. I returned it to the store to try to fix it but today i follow with the same problem. I dunno what should I do.

Also i realized that if im going to record my screen the problem disappears. It happens since the last update.

I called Apple support and they gave me a button combination. I don’t really know what did it do but i noticed a better performance on my iphone 12 pro. This is the sequency—> Up volume, down volume and keep side button. You must wait some seconds and don’t slide to turn it off, just keep pressing. It works me, best wishes

Today i’m still having the same problem...