[Webkit-unassigned] [Bug 45170] New: dragging a slider over population pyramid is slow and lagging

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=45170

           Summary: dragging a slider over population pyramid is slow and
                    lagging
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh Intel
               URL: http://vis.uell.net/testcases/slider.svg
        OS/Version: Mac OS X 10.6
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: SVG
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: svg at live.de
                CC: zimmermann at kde.org


on the animated population pyramid of statistics Germany 

http://www.destatis.de/bevoelkerungspyramide/

choose "Altersgruppen ändern" (de) or "Change Age-Groups" (en) in the lower right. The pyramid then changes its color and exposes two blue rectangles that are used as sliders, allowing you to change age groups. Moving these sliders is slow and laggy and selects the text. This is a lot smoother in other browsers.

During SVGopen this could be reduced to SVG being part of HTML in the above example and the following reduced testcase as standalone SVG doesn't reproduce the behaviour

http://vis.uell.net/testcases/slider.svg

Keep in mind however that this standalone SVG doesn't do any computations while dragging the slider (in this case a yellow rectangle).

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