[Webkit-unassigned] [Bug 39717] New: very slow QVariant QWebFrame::evaluateJavaScript(const QString& scriptSource) method.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=39717

           Summary: very slow QVariant QWebFrame::evaluateJavaScript(const
                    QString& scriptSource) method.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Windows XP
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: WebKit Qt
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: stawel at gmail.com


Hi all,

I noticed that the QWebFrame method evaluateJavaScript(const QString& scriptSource) is very slow.

consider this code:

class MyClass : public QWebFrame {

    void do() {
            QString script = QString(" \
                      var main = document.getElementById('main'); \
                      var newDivElement = document.createElement('div'); \
                      main.appendChild(newDivElement); ");

            //first loop execution time > 5 minutes  !!!!!
            for(int i=0;i<500;i++) 
                 evaluateJavaScript(script);

            //second loop execution time < 0.1 sec
            for(int i=0;i<500;i++) 
                 evaluateJavaScript(script + "false;");
    }
}

it looks like that the calculation of the result (JSC::Bindings::convertValueToQVariant)
is very slow.
maybe a lazy calculation would be better.

Best Regards

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