[Webkit-unassigned] [Bug 22280] New: REGRESSION: r37698+ - Animated GIF slowdown

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=22280

           Summary: REGRESSION: r37698+ - Animated GIF slowdown
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh PowerPC
               URL: http://www.aintitcool.com/
        OS/Version: Mac OS X 10.5
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Images
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: kevin at rhubarbproductions.com


r37605 - performance is fine
r37698+ - performance drops.

I've removed the flash plugin during testing to remove it's performance hit
from the equation.

When loading the site above, there's an animated gif in the upper left corner
that I believe is the source of the issue. Sitting on the page, the
responsiveness of Safari begins to decrease. The best way to begin to see this
is to use your scroll wheel to scroll the animated gif off and then back on the
screen repeatedly. You should begin to notice the scrolling becomes more and
more sluggish and glitchy. Also, you'll notice rolling over the bookmark bar
links becomes sluggish with the gif on screen. Eventually I start seeing the
spinning color wheel making everything un-responsive. Then it the wheel comes
and agos as the performance seems to cycle up and down and  cpu usage starts to
peg. You can try to close the tab or quit and eventually it will do so and then
normal performance returns. This site uses very large animated gifs which might
be what separates this from other sites with gifs.


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