Panning in `with_winit` is laggy with macOS utilities

[matthewgapp]

I'm on an M1 macbook, running the with_winit example with --release. There is considerable lag when I begin a drag to pan the image with mouse drag and drop. The lag is very noticeable (500ms - 1s). If I continue dragging without lifting the left mouse, the lag disappears.

[DJMcNab]

Are you perhaps using the 'Magnet' application, which has been known to introduce similar lag? The recommended solution if so is to stop using that application.

[matthewgapp]

@DJMcNab thanks for the response. That issue seems slightly different (the lag in that issue arises when dragging the entire window via the title bar; but my lag arises when panning the contents inside the window.

I'm not using Magnet but, curiously, I can reproduce the titlebar lag. So perhaps the issue I'm experiencing, the titlebar lag, and the issue you mentioned are all caused by the same underlying problem that spans beyond Magnet. I'm going to do a little digging and will come back here with my findings. Then we can close and link this to the appropriate repo.

[DJMcNab]

Interesting. Lag inside the window is reminiscent of https://xi.zulipchat.com/#narrow/stream/354396-xilem/topic/Xilem.20example.20laggy - however the conclusion there was also the use of Magnet IIRC.

Hopefully we can reach a good conclusion. If you want to further walk through what you try, to see if anyone else has any ideas, feel free to make a topic in:

Another thing to try is toggling vsync on and off (which is the V key)

[DJMcNab]

Does this still reproduce for you?

[buckynbrocko]

Are you using Ryan Hanson's Multitouch utility?
While Multitouch is enabled I get the same exact behavior - massive lag that eventually resolves if I continue to drag. Disabling it eliminates the lag.

[DJMcNab]

This isn't very actionable from our side. Our current suggestion is to stop using the utilities which break macOS, and either get the author of those utilities to debug and fix this in winit, or request a refund.