Unfortunately I feel you’re pain. You’re having the same issues I was having. I couldn’t even play Call of duty mobile while running any of the iOS 16 versions. I even tried iOS 16.2 and some other betas. The iPhone 13 Pro Max (what I use) is not a good gaming phone. It has the new “pro-motion” feature that doesn’t having gamers in mind. You can turn off the pro-motion which limits your FPS to 60. But if you leave it on while gaming it constantly changes while playing based on the speed of your finger as you swipe to accelerate or decelerate the refresh rate. It can automatically adjust the refresh rate to as low as 10Hz when you’re not moving in game. It’s a terrible feature and I would have never upgraded my phone knowing this. Why Apple doesn’t have the option to lock in the 120hz is a mystery. Combine this stupid feature with the plethora of performance issue in iOS 16 and you get what you’re dealing with now. The ONLY way was able to fix the issues is by downgrading back to iOS 15.7.1. Yes, it can still be done even though that version of iOS is an “Unsigned IPSWs.” It involves downgrading to iOS 15.6 then jumping to 15.7.1. You’ll have to that research on your own. My advice is ditch Apple if you’re a gamer.