Pubg mobile 90 Fps problem by using Guided Access

Hello Apple!

I'm going to tell you honestly that why i turned myself to buy iPhone because i have heard very good things and quality about mobile phone. I'm on Iphone 13 pro max right now. Before this i was using android phones for the whole time but i was got annoyed by their software bugs. After that i wanted to buy a phone in which I don't find any trouble with it's software and iPhone was the best option which i have been told by every gamer.

The problem is i bought this iPhone model so that i can be able to play on 90Fps without any lag. But when i turn on guided access option then game starts doing lag very much i can't play it. The most sad thing is that's it been more then 1 and half year and iPhone developers are unable to fix this problem. I'm very disappointed now after spending my whole savings to buy this phone🥺