Bug 45238

Summary: DHTML animation with setTimeout is slow due to 10ms clamping
Product: WebKit Reporter: John A. Bilicki III <jab_creations>
Component: DOMAssignee: Nobody <webkit-unassigned>
Status: RESOLVED INVALID    
Severity: Normal CC: ap, mjs
Priority: P2    
Version: 528+ (Nightly build)   
Hardware: All   
OS: All   
Attachments:
Description Flags
DHTML Width Animation none

John A. Bilicki III
Reported 2010-09-04 18:38:34 PDT
The script in this XHTML file animates quickly in Opera 10.6/10.7 and is slow in IE9, Firefox 3.6/4 Beta 4, and Safari 5.
Attachments
DHTML Width Animation (2.28 KB, application/xhtml+xml)
2010-09-07 13:32 PDT, John A. Bilicki III 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Alexey Proskuryakov
Comment 1 2010-09-07 12:33:38 PDT
There is no XHTML file attached. Please note that the timeout is clamped to 10ms in most browsers, so that a buggy page that specifies 0 doesn't take too much CPU resources. Chromium has a lower value for that, and maybe Opera does, too?
John A. Bilicki III
Comment 2 2010-09-07 13:32:10 PDT
Created attachment 66757 [details] DHTML Width Animation
John A. Bilicki III
Comment 3 2010-09-07 13:32:44 PDT
I am certain I attached it originally; I've attached it again.
Alexey Proskuryakov
Comment 4 2010-09-07 14:18:11 PDT
Yes, this page uses 1ms setTimeout, so it runs up to 10x slower in browsers that do clamping. We're considering changing that, but the behavior is currently by design, so resolving as INVALID. You can consider using CSS transitions instead - that will be smoother and less CPU intensive.
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