Framerate drops when game starts but after X minutes it backs to 60 FPS (old iPhone, iPad)

Phaser 3
1

Hello,

I’m testing my game on mobile devices but I got problems on old devices: iPhone SE 2016 and iPad Air 2 only.

When I launch the game it got 60FPS but when the game starts the framerate drops to 26FPS.
I have to wait 1min and 40 seconds to get 60FPS in the game.
If I restart the Game scene the framerate drops again.
Same problem on iPhone SE 2016 and iPad Air 2.

Zero problem on iPhone SE 2020 and Samsung Galaxy J6+

I also tried to disabled all antialiasing but when the game starts I always got this issue.

Thanks.

2

You can try profiling.

3

How to profiling on iPhone?