We have detected a build metrics regression from push: https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=78d64d99d2b06fa62a0db764e330b5cc5e64ace1&tochange=8355e37f9d18a8f5d6684c148d5e0798707ad6a4 As author of one of the patches included in that push, we need your help to address this regression. Regressions: >250KBytes installer size osx-cross opt 65,962,184.12 -> 66,242,989.75 You can find links to graphs and comparison views for each of the above tests at: https://treeherder.mozilla.org/perf.html#/alerts?id=14311 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 jobs in a pushlog format. To learn more about the regressing test(s), please see: https://developer.mozilla.org/en-US/docs/Mozilla/Performance/Automated_Performance_Testing_and_Sheriffing/Build_Metrics

There’s nothing we can do there, this code used to be disabled for performance reason, and now we’ve re-enabled it improving our YouTube playback.