102585 2012-11-17 00:28:03 -0800 Performance degradation while rendering MathML content, freezes the tab. 2012-12-03 12:42:28 -0800 1 1 1 Unclassified WebKit MathML 528+ (Nightly build) PC Windows 7 RESOLVED FIXED P1 Critical --- 102352 0 ancil0504 tony cgarcia davidc dbarton eric fred.wang ojan tony webkit.review.bot oldest_to_newest 769917 0 174814 ancil0504 2012-11-17 00:28:03 -0800 Created attachment 174814 Test Page 1 There is a performance degradation on latest Chrome Canary builds and Webkit Nightly builds(WebKit-r131444) while rendering MathML content. Verified on older nightly builds and found that after change set r128837 (Mathml to use flexboxes) the issue is seen. Findings below WebKit-r128813: Test page 1 & 2 works well on WinLauncher and Webkit.exe WebKit-r128857/WebKit-r131444: Test page 1 - Renders after a perceivable delay in WinLauncher and Webkit.exe Test page 2 - Both Winlauncher & Webkit.exe freezes/hangs Chrome Canary Version 25.0.1326.0 canary: Test page 1 - Renders after a perceivable delay. Test page 2 - Application freezes/hangs and after sometime shows 'Page unresponsive' pop-up. 769918 1 174815 ancil0504 2012-11-17 00:28:34 -0800 Created attachment 174815 Test Page 2 771031 2 tony 2012-11-19 14:33:17 -0800 This is because an auto sized column flexbox requires 2 layouts. If you nest them, this creates 2^n layouts. Bug 102352 should fix this issue. 771926 3 cgarcia 2012-11-20 09:25:34 -0800 Yes, I confirm both test cases render fast with patch attached to bug #102352 781676 4 177291 tony 2012-12-03 11:13:21 -0800 Created attachment 177291 Patch 781715 5 177291 webkit.review.bot 2012-12-03 11:39:29 -0800 Comment on attachment 177291 Patch Rejecting attachment 177291 from commit-queue. Failed to run "['/mnt/git/webkit-commit-queue/Tools/Scripts/webkit-patch', '--status-host=queues.webkit.org', '-..." exit_code: 2 Last 500 characters of output: it line 152. Failed to run "['Tools/Scripts/update-webkit', '--chromium', '--force-update']" exit_code: 2 Updating OpenSource From http://git.chromium.org/external/Webkit + 1bf3e3e...e4b679b HEAD -> origin/HEAD (forced update) error: Ref refs/remotes/origin/master is at e4b679b9687bbd8bc190703dbf1027d8a33fdfb6 but expected 1bf3e3e6422a99acd8c135b162e171c31481e2dd ! 1bf3e3e...e4b679b master -> origin/master (unable to update local ref) Died at Tools/Scripts/update-webkit line 152. Full output: http://queues.webkit.org/results/15117481 781780 6 177291 webkit.review.bot 2012-12-03 12:42:24 -0800 Comment on attachment 177291 Patch Clearing flags on attachment: 177291 Committed r136428: <http://trac.webkit.org/changeset/136428> 781781 7 webkit.review.bot 2012-12-03 12:42:28 -0800 All reviewed patches have been landed. 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