[Webkit-unassigned] [Bug 136433] New: REGRESSION (r172832): Poor 2-finger scrolling performance at theverge.com articles (all tiles repaint)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=136433

           Summary: REGRESSION (r172832): Poor 2-finger scrolling
                    performance at theverge.com articles (all tiles
                    repaint)
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
               URL: http://www.theverge.com/2014/8/31/6091393/anandtech-fo
                    under-anand-shimpi-retires-from-journalism-to-join-app
                    le
        OS/Version: Unspecified
            Status: NEW
          Keywords: InRadar, Regression
          Severity: Normal
          Priority: P1
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: mitz at webkit.org
                CC: sam at webkit.org, bdakin at apple.com,
                    simon.fraser at apple.com, thorton at apple.com


Performing a two-finger scroll gesture on theverge.com articles causes all tiles to repaint, and scrolling either doesn’t happen or happens very slowly.

To reproduce, navigate to the URL and two-finger scroll vertically. With repaint counters on, you’ll see that all the tiles repaint with every wheel event (even if the page doesn’t scroll at all).

This was cause by <http://trac.webkit.org/r172832>, the fix for bug 91655.

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