RESOLVED FIXED 76725
[Regression] 2% Page Cycler Moz regression 
https://bugs.webkit.org/show_bug.cgi?id=76725
Summary [Regression] 2% Page Cycler Moz regression
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Adam Barth
Comment 2 2012-01-20 12:12:07 PST
These two look like the leading candidate for causing the regression: http://trac.webkit.org/changeset/105426/trunk/Source http://trac.webkit.org/changeset/105423/trunk/Source
Adam Barth
Comment 3 2012-01-20 12:13:13 PST
I think we should try rolling out http://trac.webkit.org/changeset/105426 because the ChangeLog mentions there's a risk of a perf regression.
Adam Barth
Comment 4 2012-01-20 12:23:27 PST
Tried reverting 105426 in http://trac.webkit.org/changeset/105532
Adam Barth
Comment 5 2012-01-20 16:38:44 PST
Reverting that patch seems to have fixed the regression. http://build.chromium.org/f/chromium/perf/vista-release-webkit-latest/moz/report.html?history=150&rev=-1
Mihnea Ovidenie
Comment 6 2012-01-22 00:03:15 PST
This is huge regression. In my tests, i have never had a regression of this scale. The initial regression introduced by the first version of the region styling patch was 2-3%. I am puzzled but i will try to take a look again at the problem.
Tony Chang
Comment 7 2012-01-22 09:14:29 PST
I think abarth just read the graph wrong. It's about 2%, like before.
Adam Barth
Comment 8 2012-01-22 11:17:18 PST
Sorry, I was just repeating what the performance sheriff wrote.
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