[Webkit-unassigned] [Bug 57554] New: [Qt] QML Webview causes performance drops

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=57554

           Summary: [Qt] QML Webview causes performance drops
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: S60 Hardware
               URL: http://https://qtrequirements.europe.nokia.com/browse/
                    QT-4834
        OS/Version: S60 3rd edition
            Status: UNCONFIRMED
          Severity: Major
          Priority: P1
         Component: New Bugs
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: timo.vitikainen at nokia.com


Performance issue is revealed using two demo applications on N8: a) QML wrapper app and b) QGraphicsWebview (non-QML) app. Both of these demo apps have the same HTML5 code (including e.g. HTML5 canvas and full-screen transitions) - see the URL.

Root cause for the revealed perf drops problem is assumed to be the page level tiling in QDeclarativeWebview. 

Another problem with the tiling (enabled in the QML WebView) is that it does not support HTML5 parallax scrolling, actually tiling kills the whole rendering of the content that includes parallax scrolling.  

Proposed fix is to disable the page level tiling from the QDeclarativeWebview. After that change tiling could be still enabled in global QWebSettings in application code (main.cpp) similarly as currently e.g. AC, if needed by the application.

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