[Webkit-unassigned] [Bug 30055] Bad DOM performance in large SVG files

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=30055





--- Comment #19 from Patrick R. Gansterer <paroga at paroga.com>  2009-11-15 18:48:26 PST ---
(In reply to comment #17)
> The problem is that if the underlying graphics library is already doing the
> tests it may have a more efficient way of doing so, add to that the fact that
> the underlying graphics libraries that do perform sensible clipping
> optimisations will still be doing their own clip tests this seems like a patch
> that has bad perf impact on good libraries to deal with poor performance in
> others.
So this patch has to move to a higher level where "more intelligent" test can
be done and the clipping should be fixed in GraphicsContextQt directly.

However the following test is much slower(!) in Safari/Chrome than in FF:
Click on "Set first lime/red" at http://paroga.com/webkit/rect.php?c=80000&s=2
On my machine: FF ~150ms, Opera ~300ms, Chrome ~2s, Safari ~10s

How to get the same performance of FF/Opera in WebCore? Any suggestions?

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