[Webkit-unassigned] [Bug 28491] New: Safari CPU usage grows to 100% while playing particular animated GIF, drops again when GIF loops

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=28491

           Summary: Safari CPU usage grows to 100% while playing
                    particular animated GIF, drops again when GIF loops
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
               URL: http://i26.tinypic.com/2m6saz4.jpg
        OS/Version: Windows XP
            Status: NEW
          Keywords: NeedsRadar, PlatformOnly
          Severity: Normal
          Priority: P2
         Component: Images
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: aroben at apple.com
                CC: hyatt at apple.com, mitz at webkit.org


To reproduce:

1. Open Task Manager and look at Safari's CPU usage
2. Go to http://i26.tinypic.com/2m6saz4.jpg (yes, that's an animated GIF even
though it has the ".jpg" extension)

As the animated GIF plays, Safari's CPU usage grows to 100% (of one CPU, so if
you have multiple CPUs it will grow to 100% / (number of CPUs)). When the GIF
loops back to the beginning, Safari's CPU usage drops back down, then starts to
grow again. (It looks like a sawtooth wave in the Performance tab of Task
Manager.)

This doesn't seem to happen on Mac.

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