We have detected a build metrics regression from push: https://hg.mozilla.org/integration/autoland/pushloghtml?changeset=10af0352b1347e6a379c676e617fa250ac53ad18 As author of one of the patches included in that push, we need your help to address this regression. Regressions: 103% build times summary osx-cross opt taskcluster-c4.4xlarge 776.51 -> 1,579.55 You can find links to graphs and comparison views for each of the above tests at: https://treeherder.mozilla.org/perf.html#/alerts?id=7778 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

:rillian Please look over this build regression from osx and state if/how we can improve the build time, as it is pretty serious.

This is expected from enabling the stylo code.