REGRESSION (r155977): Very stuttery 3D css animation on jtechcommunications.com

• Component: Animations
• Status: RESOLVED FIXED

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)

[Alexey Proskuryakov]

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>.

[Simon Fraser (smfr)]

Created attachment 231920 [details]
Patch

[Tim Horton]

Comment on attachment 231920 [details]
Patch

Very sad :(

[Simon Fraser (smfr)]

https://trac.webkit.org/r169229

[Mark Hahnenberg]

(In reply to comment #4)
> https://trac.webkit.org/r169229

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

compositing/tiling/rotated-tiled-clamped.html
compositing/tiling/rotated-tiled-preserve3d-clamped.html

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

[Simon Fraser (smfr)]

I'll rebaseline those.

[Simon Fraser (smfr)]

https://trac.webkit.org/r169278