Cool. Are you able to share any more details? I'm guessing this isn't a standard WinForms app. What advantages does moving away from GDI+ give you?

It’s a winforms app, and there isn’t much nonstandard about it other than that large performance sensitive drawing apps are perhaps quite nonstandard to begin with. We want to handle some large cad scenarios in it (e.g smooth pan/zoom in drawings with 500k lines), it’s not the default use case, but it happens. The main advandtage over gdi+ ) is better support for retained mode drawing (record/playback style drawing), more efficient automatic culling, etc.

Why are you converting to SkiaSharp, if I may ask? Is it for performance or multiplatform reasons?

See my answer on the other msg

Cool, how does it compare to Win2D?

It’s just a lot less ”different”. Performance is pretty similar across all frameworks, and is much more dependent on call patterns than anything else.