[Webkit-unassigned] [Bug 231031] REGRESSION (Safari 15): WebGL Video Texture Performance Regression - Looks GPU-process related

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=231031

--- Comment #5 from Dustin Kerstein <dustin.kerstein at gmail.com> ---
See here for another simple replication test case - https://jsfiddle.net/qz9ka6xm (using RGBA textures from a very simple cycling color video).

On stock Safari 15 + latest Beta 15.1 Safari + Safari Technical Preview, when using my 2018 Macbook Pro i9 I am always seeing around 18-20fps in that above test, regardless of enabling GPU Process WebGL and/or WebGL Metal.

However, on a Macbook 13 M1, enabling WebGL Metal on Safari 15, seems to fix the issue entirely, with fps >50. When WebGL Metal is disabled (ie. the default setting), I see 4fps - Which results in breaking many WebGL dependent websites. 

Has there been any work / investigation into these serious performance regressions?

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