[Webkit-unassigned] [Bug 235002] readPixels directly to ArrayBuffer has very high CPU usage

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=235002

--- Comment #11 from Simon Taylor <simontaylor1 at ntlworld.com> ---
(In reply to Gregg Tavares from comment #9)
> fyi: In my experiments if you render to your own texture (via a framebuffer)
> you'll get your speed back. Based on the trace above my guess it's the
> IOSurfaceLock/Unlock causing the slowdown. That's only needed for reading
> the canvas itself, not for reading your own texture.
> 
> Of course we should optimize reading the canvas too, just pointing out a
> possible workaround.

Thanks Gregg. I did eventually discover that myself in Comment 6.

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