[Webkit-unassigned] [Bug 21938] New: suboptimal scrolling performance in gmail (firefox3 is much faster)

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Tue Oct 28 16:00:00 PDT 2008


           Summary: suboptimal scrolling performance in gmail (firefox3 is
                    much faster)
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: darin at chromium.org
                CC: hyatt at apple.com, koivisto at iki.fi

suboptimal scrolling performance in gmail (firefox3 is much faster)

firefox3 scrolling performance degrades to match webkit levels when a chat
window is showing.  the chat window in gmail is rendered using a fixed position
element, so it would appear that firefox3 is discovering that it should not
optimize the scrolling due to the presence of a fixed position element.

webkit would suffer from bug 5909 on gmail (when a chat window is exposed)
except for the fact that the frame being scrolled has a transparent background.
 the parent to the frame has a solid white background, so the net result is a
white background.  i suspect that firefox3 notices this and then determines
that it is safe to do optimized scrolling.  webkit should do the same.  i still
need to confirm this theory ;-)

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