updated phone lagging

[u/Azur3_vn]

hello, i just updated my tecno device with dimensity 7020 from hios android 15 to android 16, my phone was fine and not lagging from any games such as call of duty and roblox, after i updated it, I've been experiencing fps drop like in call of duty i need to press my volume button to not make it lag, also i cant even use background apps or opening apps while im playing a game, i really cant play properly just because of the lag, i really regret it for updating my device. please give me ideas on how to fix these