[Webkit-unassigned] [Bug 248223] [GTK] Significant graphics performance regressions

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=248223

--- Comment #4 from Michael Catanzaro <mcatanzaro at gnome.org> ---
(In reply to Miguel Gomez from comment #3)
> Was threaded rendering enabled for WebKitGTK 2.37.90? Is it now disabled for
> WebKitGTK 2.39.1? Cause that affects CSS and SVG, and could be the reason of
> the increase in performance between those versions.

That seems like a pretty good guess. It was disabled in 256526 at main which landed just before 2.39.1. But there is an environment variable override: you can use WEBKIT_NICOSIA_PAINTING_THREADS=4 to go back to the previous behavior, so you can benchmark again without needing to downgrade anything and see if that is to blame. Seems pretty likely.

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