lagging on ios

[dsxailab]

looks like it only happens for the first few drawables. once there are enough drawables the bug goes away

Can reproduce on iPhone 14 pro max simulator and iPad Mini (6th gen) simulator, and a real iPhone 14 Pro max device. Didn't try others but I believe it will give the same result. BTW, the web version works fine.

Screen.Recording.2023-07-23.at.12.17.03.pm.mov

[kundanlal5555]

I was faced same issue in IOS 16.x with Flutter 3.10.x.

Solution:
Downgrade flutter version to 3.7.10 (Use flutter version 3.7.10). work fine in IOS 16.x

[SarahHayat]

I reproduce in Flutter 3.13.0 and iOS 16.5.1

[synapticvoid]

The problem seems to be linked to the new Flutter rendering engine, Impeller, which is now enabled by default on iOS.

Disabling it seems to fix the issue:

flutter run --no-enable-impeller

You can also disable it when deploying your app, in your app's Info.plist:

 <key>FLTEnableImpeller</key>
  <false />

[Dakrain]

Any other way yet?

[deepanchal]

Possible related issues:

• [Impeller] Flickering lines when drawing on Canvas with CustomPainter on iOS flutter/flutter#129235
• [Impeller] Especially complex paths cause rendering errors, freezes flutter/flutter#126212
• [Impeller] Fallback to no index buffer when tesselation count is large, split up nonZero contours. flutter/engine#46282