[Webkit-unassigned] [Bug 191197] SVG filters crash on iOS and are slow in general

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=191197

--- Comment #2 from Jan Bösenberg <jan.boesenberg at incors.com> ---
For filters on monochrome rectangles (like in the example) where all pixels are manipulated the same (feColorMatrix, feComponentTransfer, etc), setting filterRes="1" will speed up things dramatically (by a factor 20 or so) and prevent the crashing.

Here is a modified version with filterRes set to 1:
https://codepen.io/anon/pen/LXYKJK

Unfortunately filterRes is obsolete in SVG2 and will be removed in the next Safari version (see bug 129565), so there will be no solution left. It's probably futile but I would suggest to keep support for filterRes in Safari until the performance issues with SVG filters are solved.

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