It seems that https://github.com/flutter/flutter/issues/90675 has discussed about this problem.
Yang-Xijie
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I encountered the same issue when using Metal framework (Xcode 13.3) to render a scrollable view on iPad Pro 11 with M1 chip (iPadOS 15.4).
MTKView works well with 120fps when I open the app and interact with it. However, opening the control center (or the notification center) and then closing it, the frame rate often drops to 80Hz.
the demo project - https://github.com/Yang-Xijie/ScrollablePencilMTKView
Does anyone has some great solutions?
Stoping the MTKView rendering and opening later by setting isPaused in SceneDelegate might be one workaround (Genshin Impact uses this).
func sceneWillResignActive(_ scene: UIScene) {
mainVC.documentVC?.renderView.isPaused = true
}
func sceneDidBecomeActive(_ scene: UIScene) {
mainVC.documentVC?.renderView.isPaused = false
}
Or some tricky methods that never stop rendering? Notability will still render its pages when user interacts with control center. I do wonder how this is achieved...