Huge render delay compared to WPF, with moveable controls

[AngryCarrot789]

I ported a few apps over to avalonia but I noticed that there was a huge increase in lag with moveable controls that make it uncomfortable to use. I'm not sure if it's UI input lag or a long render delay that avalonia has.

I made a repo and video to show the differences:

Untitledvid.mp4

https://github.com/AngryCarrot789/TestRenderLagAvWpf

In the WPF example, the cursor is almost always inside the rectangle since it's redrawing so quickly. But with the Avalonia example, maybe the input processing is slower or rendering is slower, because the rectangle is lagging far behind the cursor

Anyone know if there's a way to overcome this? I'm even following other people's recommendations using AngleEgl rendering mode and LowLatencyDxgiSwapChain composition mode, and you'll see in the git repo I'm using a CompositionCustomVisualHandler to draw the orange rectangle directly on the render thread (and the actual control hosting it is drawing yellow so the custom visual handler has made no difference)

[arnirichard]

Avalonia rendering is much slower in debug mode, you need to run release mode.

[AngryCarrot789]

I get the exact same results in release mode

[StefanKoell]

Are you running debug/release mode with the debugger attached? I often notice slow downs when a debugger is attached.

[AngryCarrot789]

I tried with and without it attached (running in rider vs running the .exe from the bin/Release/net8.0 folder), and they both look the exact same

[rabbitism]

This is fully discussed in this thread

#14062