Ios 15.5 Performance and Bluetooth connectivity issues.

After I updated my iphone to 15.5. I've been encountering a lot of issues when playing games in it. The FPS keeps dropping below 20. Performed a hardware reset. And reset all settings. Disabled Background app refresh. And close all recent used apps. Still encountering a performance problem. Another one is the display keeps dimming. Auto brightness is off. True tone and night shift is off. Low Power Mode is off. And the brightness is set to maximum. Still keeps dimming.

Bluetooth connectivity when using a gamepad. Keeps disconnecting. Issues with latency.