Poor Gaming Perfomance on iPhone XS Max

I’ve noticed the same thing as well, pretty much in every FPS game. I’ve tried playing the same games on other Xs max phones and they all do the same thing, I’ve noticed the smaller Xs doesn’t do this. Which leads me to conclude that games aren’t optimized yet for the bigger screen. However, Fortnite for example, if you begin screen recording, looking around becomes fluid and if you turn it off, looking around becomes choppy again. Overall, I’ve noticed my 6s plus is also more fluid throughout the UI of the phone in general compared to my Xs max. I think apple needs to optimize the low performance cores to keep the UI fluid and game developers need to optimize for the bigger screen. But in short, you’re not the only one :)