[Webkit-unassigned] [Bug 73238] New: REGRESSION (r101202): Incredibly poor scrolling performance on WebKit Bugzilla bug list page

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=73238

           Summary: REGRESSION (r101202): Incredibly poor scrolling
                    performance on WebKit Bugzilla bug list page
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
               URL: http://webkit.org/new-bugs/3d
        OS/Version: Unspecified
            Status: NEW
          Keywords: Regression
          Severity: Normal
          Priority: P1
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: mrowe at apple.com
                CC: hyatt at apple.com, mitz at webkit.org,
                    jchaffraix at webkit.org, simon.fraser at apple.com,
                    dglazkov at chromium.org, robert at webkit.org,
                    webkit-bug-importer at group.apple.com


After r101202 I’m seeing the WebKit Bugzilla new bugs list at <http://webkit.org/new-bugs/3d> scroll at perhaps three or four frames per second. Prior to that revision the page scrolled at around 40fps. A sample shows that almost all of the time is being spent below RenderTable::paint, with most of that inside RenderTableCell::paintCollapsedBorder.

A related side-effect is that when switching to a tab containing <http://webkit.org/new-bugs/3d> I often see it flicker blank before the contents appear.

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