[Webkit-unassigned] [Bug 100169] New: We should make TileCache tiles the size of the tile coverage rect when we can't do fast scrolling

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=100169

           Summary: We should make TileCache tiles the size of the tile
                    coverage rect when we can't do fast scrolling
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: InRadar
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: bdakin at apple.com


Some websites that don't do fast scrolling still scroll slower than they do with tiled drawing disabled. https://bugs.webkit.org/show_bug.cgi?id=99768 addressed some of this performance problem, but there is still more ground to make up. I propose that we make tiles the size of the window when we can't do fast scrolling. This seems to have a noticeable improvement on sites like Facebook.

<rdar://problem/12505021>

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