I play genshin on iphone 13. Very smooth. Even more smooth than on my iPad 8th gen. Due to processing speed.

If u want lag free all the time, put a heat sink fan behind your iPhone when gaming.


The heat sink more important than the fan. Will really help cool your iPhone. Do note it will need to be plugged in via USB c all the time to work. Don't buy those built in battery type no point as it drains even my power bank super fast when using.

Lastly I play on low settings 60 refresh rate for Genshin. 60 refresh rate enough to lag my phone after an hour's play (if no cooler plugged in). The game is very graphic intensive.