Talos has detected a Firefox performance regression from push:

https://hg.mozilla.org/integration/autoland/pushloghtml?changeset=b371f612cd60dce156d732f32a50a48eded9d3ab

As author of one of the patches included in that push, we need your help to address this regression.

Regressions:

60% tsvgx windows7-32-shippable opt e10s stylo 122.43 -> 195.60
57% tsvgx windows7-32-shippable opt e10s stylo 121.31 -> 189.93
40% tsvgr_opacity windows7-32-shippable opt e10s stylo 115.75 -> 161.97
28% tsvg_static windows7-32-shippable opt e10s stylo 51.99 -> 66.58

Improvements:

5% tabswitch windows7-32-shippable opt e10s stylo 11.01 -> 10.47
3% tscrollx windows7-32-shippable opt e10s stylo 0.69 -> 0.67
2% tart windows7-32-shippable opt e10s stylo 2.33 -> 2.28

You can find links to graphs and comparison views for each of the above tests at: https://treeherder.mozilla.org/perf.html#/alerts?id=24779

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/TestEngineering/Performance/Talos

For information on reproducing and debugging the regression, either on try or locally, see: https://wiki.mozilla.org/TestEngineering/Performance/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/TestEngineering/Performance/Talos/RegressionBugsHandling

This was fixed by the backout of bug 1604535.