IPad Pro 2020 90fps frame drops PUBG

What the heck apple I buyed iPad Pro just for pubg and it lags Like some cheap phone why u can’t u optimise it many have already asked it seems u guys after seeing it also no one replies and FPS really seen by eyes when.set to 90 FPS it is like 30 to 35 FPS plz fix it asap apple looks premium customer care is awesome but there are heck lot problems in iOS then android