Bug 133179 - REGRESSION (r155977): Very stuttery 3D css animation on jtechcommunications.com
Summary: REGRESSION (r155977): Very stuttery 3D css animation on jtechcommunications.com
Alias: None
Product: WebKit
Classification: Unclassified
Component: Animations (show other bugs)
Version: 528+ (Nightly build)
Hardware: Macintosh Intel OS X 10.9
: P2 Normal
Assignee: Simon Fraser (smfr)
URL: http://www.jtechcommunications.com
Depends on:
Reported: 2014-05-22 08:07 PDT by pmilvich
Modified: 2014-05-23 13:33 PDT (History)
6 users (show)

See Also:

Patch (35.28 KB, patch)
2014-05-22 16:54 PDT, Simon Fraser (smfr)
dino: review+
Details | Formatted Diff | Diff

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Description pmilvich 2014-05-22 08:07:55 PDT
In the nightly build for webkit the 3d portion of the animation on the home page of http://www.jtechcommunications.com suffers from bad performance. This animation is nice and smooth in Safari 7.0.3.

The animation is using the rekapi library (http://rekapi.com) to dynamically create the css animation code and inject it as a style. I suspect it's related to the latest work on the JIT css.

Disabling the dynamic css generation and simply setting the values speeds it up on the nightly build, though it is still slower than Safari 7.0.3 w/o the css. (w/o access to the code you can get the non-css generating version by setting the user agent to be chrome - we only had the css version enabled on webkit for safari)
Comment 1 Alexey Proskuryakov 2014-05-22 11:41:25 PDT
I see WebProcess use a lot of CPU time, and frequently pause (sometimes for a second or so).

Regressing this, it looks like <http://trac.webkit.org/r155977>.
Comment 2 Simon Fraser (smfr) 2014-05-22 16:54:49 PDT
Created attachment 231920 [details]
Comment 3 Tim Horton 2014-05-22 16:56:34 PDT
Comment on attachment 231920 [details]

Very sad :(
Comment 4 Simon Fraser (smfr) 2014-05-22 16:58:38 PDT
Comment 5 Mark Hahnenberg 2014-05-23 11:06:37 PDT
(In reply to comment #4)
> https://trac.webkit.org/r169229

This appears to have broken the following tests on the WK2 bots:


Here are the results: http://build.webkit.org/results/Apple%20Mavericks%20Release%20WK2%20(Tests)/r169229%20(5896)/results.html

Here is the build history that shows it regressed after this revision: http://build.webkit.org/builders/Apple%20Mavericks%20Release%20WK2%20(Tests)?numbuilds=50
Comment 6 Simon Fraser (smfr) 2014-05-23 11:13:57 PDT
I'll rebaseline those.
Comment 7 Simon Fraser (smfr) 2014-05-23 13:33:18 PDT