Safari in iOS 15 performance issues #1182

Hi!

So I have a konva canvas thats quite large - about 5000x5000. I've found that there's a new feature in iOS that drops the konva performance very significantly. Dragging has almost a second delay. It's called "GPU Process: Canvas Rendering". It's essentially GPU acceleration for the HTML canvas. It's defaulted to being enabled for iOS 15, but this completely breaks my app.

On a iPhone or iPad, you can go to safaris experimental features and disable it, then the performance drastically increases. I'm not sure if this is something that can be fixed but thought I'd bring the issue up.

Thoughts?