[Bug 85064] Intel DRI3 causes extremely slow scrolling on certain pages with WebKitGTK+

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85064

--- Comment #2 from Michael Catanzaro <mcatanzaro at gnome.org> ---
(In reply to Eero Tamminen from comment #1)
> Does Mesa commit f7a355556ef5fe23056299a77414f9ad8b5e5a1d help?

I'll try to test this as soon as I can. Sorry for the delay.

> (It works around DRI3 sync slowdown, but there are also other slowdown bugs
> for DRI3 here in FDO bugtracker, just search for "DRI3".)
> 
> Does Epiphany/WebKitGTK+ uses GL for something else besides WebGL

Yes, most notably for accelerated compositing:

"alex:  I mean, accelerated compositing is activated by default and probably is
creating some graphic layers that are composited using GL in that webpage"

> , or do
> these problematic pages use WebGL?  

We actually have WebGL disabled by default.

> Or how Mesa is involved in this (DRI3 is
> mainly X server side thing)?

It might not be a mesa bug; I just filed against mesa because bug #81623 was
filed against mesa.

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