[Webkit-unassigned] [Bug 192982] [GTK] Garbled rendering on Youtube while scrolling under X11.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=192982

--- Comment #12 from Miguel Gomez <magomez at igalia.com> ---
(In reply to Alicia Boya García from comment #10)
> (In reply to Miguel Gomez from comment #9)
> > The excessive CPU usage is reproducible playing a normal video, both with
> > and without AC. I've tested that it happens even if we are not painting the
> > video frames at all, so I must be something inside gstreamer.
> > 
> > I see that while playing a youtube video with 1080p it's using all my system
> > processors (8) at 20% each.
> > 
> > BTW, I'm using Fedora 29 as well. Maybe it's a decoding issue? Charlie,
> > Calvaris, Alicia, any thoughts?
> 
> Software decoding video (especially VP9) is a parallelizable CPU intensive
> task, so there being a noticeable CPU usage is nothing unusual by itself.
> 
> Of course, the complex graphic pipeline WebKit introduces to render the
> video inside a webpage can also have an impact.

Ok, I wasn't expecting the decoding to happen on the CPU, that explains a lot. I guess I'm too used to embedded devices where there's a hw decoder available :). No issue with the CPU usage then.

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