On iphone 15 pro max. On start up screen you can see background lag because of spikes when playing you have lag spikes looking around or moving around. Lag spikes just opening settings or inventory. The screen will just freeze depending on device it gets worse. As in picture freezes longer or more consistently.  In my opinion it's unplayable. Imagine jumping a crevice and then a spike then you end up dying or if it spikes during battle.

Not much to say minecraft performance sucks! I have a high end phone and I'm seeing this? It's not even that old yet still the latest and best in the iPhone lineup.