Manam1401 , via OnePlus 9 , Jul 25, 2021 : With the recent 1.5.0 update both PUBG/BGMI now supports 90fps in OnePlus 9. But it actually is not running in 90fps. When the game is opened the refresh rate is switched from 120hz to 60hz. So even when we choose 90fps in-game all we get is 60fps. This can be seen using in-built game mode fps data and some third party fps apps as well which are legit. I can confirm that other Snapdragon 888 phones are running 90fps so I think this is the issue on OnePlus' end.