[Webkit-unassigned] [Bug 236173] Big drop in canvas performance above 3840px

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=236173

--- Comment #4 from webkit_org at zdanowski.pro ---
(In reply to Myles C. Maxfield from comment #2)
> How big would be sufficient for you?

Correct me if I'm wrong but I believe the largest supported display on any macOS hardware now will be Pro Display XDR, which can result in a framebuffer size of 2x native so 6K*2 => 12032x6768 (~81Mpx). However, this this may be too much for the most hardware to handle anyway. In comparison Blink is able to handle ~132Mpx on M1 Max before frames are dropped.

I think, seeing as a lot of people run 4K screens scaled, the size of 7680x4320 would be reasonable, allowing for @x2 on canvases.

Do you maybe happen to know why this limit exists, and is there still a valid usecase for its existence? Exposing that limit will also be useful as it took me quite a while to figure out why the app magically halves its performance when a window is resized.

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