[Webkit-unassigned] [Bug 30293] New: [Qt] performance regressions on loading page after ImageDecoderQt changes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=30293

           Summary: [Qt] performance regressions on loading page after
                    ImageDecoderQt changes
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Mac OS X 10.5
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: zecke at selfish.org


The old and new code has been executed on the same data and 30 iterations each.
The majority of cases are faster, some show a regression we should need to
understand. The point of this bug is to understand the cause of this
regression.

loading test
row   - slower in msecs on 30 iterations

row01 - 3msec
row02 - 6msec
row14 - 844msec
row16 - 1031msec
row19 - 538msec
row22 - 49msec
row24 - 73msec
row25 - 693msec
row26 - 705msec
row30 - 3msec
row32 - 1785msec
row37 - 35msec
row39 - 261msec


cycling: slower in msecs on 30 iterations

row09 -  9msec
row11 - 39msec
row17 - 1msec
row27 - 10msec
row30 - 8msec
row32 - 114msec
row38 - 1msec
row39 - 1051msec

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