[Webkit-unassigned] [Bug 97905] New: [SVG] Update of element referenced by multiple 'use' nodes is absurdly slow

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=97905

           Summary: [SVG] Update of element referenced by multiple 'use'
                    nodes is absurdly slow
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: SVG
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: blambov at google.com
                CC: zimmermann at kde.org


Created an attachment (id=166239)
 --> (https://bugs.webkit.org/attachment.cgi?id=166239&action=review)
Testcase

The attached SVG animation contains an unit element that is used to draw a few hundred triangles by a hierarchy of 'use' nodes. 

The file animates the scale attribute of the unit element. This results in an update that takes tens of second for a single frame (i.e. on the order of 1/10 s for each triangle drawn!).

Tested on Chrome Linux + MacOS and Safari MacOS, all have the problem.


Opera runs this animation at 50 fps. Internet Explorer also does this smoothly.

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