[Webkit-unassigned] [Bug 240865] [GTK] Webpages completely slow down when CSS blur filter is in use

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Sat Sep 9 07:03:50 PDT 2023


https://bugs.webkit.org/show_bug.cgi?id=240865

--- Comment #12 from Michael Catanzaro <mcatanzaro at redhat.com> ---
(In reply to Carlos Garcia Campos from comment #4)
> Created attachment 462701 [details]
> Test case
> 
> There are two files in the tarball:
> 
> - test-cpu.html: it has several images with blur filter. It's slow, it's
> easier to reproduce by resizing the window rather than just scrolling.
> 
> - test-gpu: it's the same but adding a translateZ transform to force the
> images to be accelerated. Performance is much better, but there are two
> issues:
>  + Rendering is ot the same as the sofotware version, it looks like
> pixelated.
>  + Images disappear when scrolling and they aren't rendered anymore even if
> the window is resized.

I tried these test files with 2.41.92 (but not 2.41.91, so I don't know how bad it was before). I didn't notice any performance problems with either test. But with the test-gpu, I noticed that rendering breaks after I scroll down and then scroll back up. The web content becomes all white. Should I report a new bug for this?

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