Talos has detected a Firefox performance regression from push a19ac5da6082. As author of one of the patches included in that push, we need your help to address this regression. Regressions: 5% tps summary windows8-64 opt 63.05 -> 66.47 5% tsvg_static summary osx-10-10 opt 66.26 -> 69.37 Improvements: 16% tscrollx summary linux64 opt 6.04 -> 5.07 16% tp5o_scroll summary linux64 opt 6.78 -> 5.7 13% tp5o_scroll summary linux64 pgo 6.18 -> 5.35 13% tscrollx summary linux64 pgo 5.66 -> 4.93 8% tsvgx summary linux64 pgo e10s 387.65 -> 354.75 8% tart summary linux64 opt e10s 7.42 -> 6.82 7% tsvgx summary linux64 opt e10s 531.67 -> 495.44 7% tart summary linux64 pgo 5.03 -> 4.7 6% tart summary linux64 pgo e10s 5.76 -> 5.4 5% tart summary linux64 opt 6.65 -> 6.32 4% tp5o_scroll summary windows7-32 opt 3.74 -> 3.59 3% tsvgx summary linux64 pgo 389.53 -> 377.67 3% tsvgx summary linux64 opt 545.45 -> 529.12 3% cart summary linux64 pgo e10s 24.51 -> 23.78 2% cart summary windows7-32 opt 36.57 -> 35.67 2% tsvgr_opacity summary linux64 pgo e10s 349.62 -> 341.05 2% cart summary linux64 opt 29.82 -> 29.11 2% tsvgx summary windows7-32 opt 618.86 -> 604.97 2% cart summary linux64 pgo 23 -> 22.49 2% cart summary linux64 opt e10s 31.64 -> 30.93 You can find links to graphs and comparison views for each of the above tests at: https://treeherder.mozilla.org/perf.html#/alerts?id=5129 On the page above you can see an alert for each affected platform as well as a link to a graph showing the history of scores for this test. There is also a link to a treeherder page showing the Talos jobs in a pushlog format. To learn more about the regressing test(s), please see: https://wiki.mozilla.org/Buildbot/Talos/Tests For information on reproducing and debugging the regression, either on try or locally, see: https://wiki.mozilla.org/Buildbot/Talos/Running *** Please let us know your plans within 3 business days, or the offending patch(es) will be backed out! *** Our wiki page outlines the common responses and expectations: https://wiki.mozilla.org/Buildbot/Talos/RegressionBugsHandling

:mattwoodrow, thanks for the heads up in bug 1325227, as you can see by this bug, we have a LOT of improvments and a couple regressions. Here is a comparison view: https://treeherder.mozilla.org/perf.html#/compare?originalProject=mozilla-inbound&originalRevision=bcda57aa0c3b&newProject=mozilla-inbound&newRevision=a19ac5da60828cdcf374e6798dc7e07b8b4c1b7d&framework=1 is there anything you can think of to reduce/fix the two regressions? Possibly it is worth keeping those regressions based on the larger list of improvements.

After talking with Matt, he will keep looking at this to understand what's going on, but we're not going to track it for 54.

just circling back here, as this code is on aurora and wanted to see if there was any update in the last couple weeks- I know this isn't a priority.

(Sorry for the bugspam!)