NEW 101418
[cg] feDropShadow performance is much worse than -webkit-svg-shadow 
https://bugs.webkit.org/show_bug.cgi?id=101418
Summary [cg] feDropShadow performance is much worse than -webkit-svg-shadow
Tim Horton
Reported 2012-11-06 18:42:56 PST
See attached testcases. Drag around the grey boxes. feDropShadow performs much worse than -webkit-svg-shadow. -webkit-svg-shadow uses GraphicsContext's shadow capabilities, while feDropShadow does the blurring and such in software.
Attachments
-webkit-svg-shadow fast case (1.67 KB, text/html)
2012-11-06 18:43 PST, Tim Horton 		no flags
Details
feDropShadow slow case (1.68 KB, text/html)
2012-11-06 18:43 PST, Tim Horton 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Tim Horton
Comment 1 2012-11-06 18:43:22 PST
Created attachment 172693 [details] -webkit-svg-shadow fast case
Tim Horton
Comment 2 2012-11-06 18:43:37 PST
Created attachment 172694 [details] feDropShadow slow case
Dirk Schulze
Comment 3 2012-11-06 18:44:24 PST
Not really surprising. It does't use CG.
Radar WebKit Bug Importer
Comment 4 2012-11-06 18:48:58 PST
<rdar://problem/12650691>
Tim Horton
Comment 5 2012-11-06 18:49:46 PST
No, not surprising at all, but we should fix it :)
Ahmad Saleem
Comment 6 2022-09-22 15:57:43 PDT
I am able to reproduce this in Safari Technology Preview 154 using "feDropShadow.." test case and dragging grey boxes does not move blurred "red" rectangles while in other browsers (Chrome Canary 108 and Firefox Nightly 107), it is almost realtime and instantaneous while Safari have sever delay in showing any movement in blurred "red" shadows.
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