[Webkit-unassigned] [Bug 97910] New: [SVG] Use references are much slower than necessary

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=97910

           Summary: [SVG] Use references are much slower than necessary
           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=166245)
 --> (https://bugs.webkit.org/attachment.cgi?id=166245&action=review)
Example setting href attribute

The attached files contain a hierarchy of 'use' elements to build a graphic containing a few hundred triangles. It is not a problem for Chrome to render the graphic fluidly (use-levels-move), but if a new 'use' element references the graphic (use-levels-new-use), or the element's 'href' is changed (use-levels-set-href), the performance falls dramatically.

WebKit is copying the elements referenced by 'use', which should not be necessary at all. In other tests we have seen that it is actually faster to explicitly recreate referenced nodes with JavaScript than to refer to them with 'use' elements.

Opera does not have this problem, and runs all these examples at ~50 fps.

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