Raptor has detected a Firefox performance regression from push:

https://hg.mozilla.org/integration/autoland/pushloghtml?changeset=5647ec4ba6f2566912e71637d2c1e063d899c103

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

Regressions:

2% raptor-tp6-office-firefox-cold fcp linux64-shippable-qr opt 485.96 -> 497.83

Improvements:

8% raptor-tp6-bing-firefox-cold fcp windows10-64-shippable-qr opt 276.92 -> 255.92
3% raptor-tp6-reddit-firefox-cold fcp windows10-64-shippable-qr opt 319.43 -> 309.17
2% raptor-tp6-bing-firefox-cold windows10-64-shippable-qr opt 253.97 -> 248.55

You can find links to graphs and comparison views for each of the above tests at: https://treeherder.mozilla.org/perf.html#/alerts?id=23675

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 Raptor jobs in a pushlog format.

To learn more about the regressing test(s) or reproducing them, please see: https://wiki.mozilla.org/TestEngineering/Performance/Raptor

*** 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

Too long ago to do anything about now.