We have detected an awsy regression from push: https://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?changeset=ef1550969466fbe9049ee922735f020af82f66d6 As author of one of the patches included in that push, we need your help to address this regression. Regressions: 8% Heap Unclassified linux64 opt stylo 80,954,313.74 -> 87,417,877.09 8% JS linux64-qr opt stylo 96,834,856.65 -> 104,310,362.06 4% Explicit Memory linux64-qr opt stylo 573,718,389.44 -> 597,078,310.82 4% Resident Memory linux64-qr opt stylo 1,064,045,257.93 -> 1,102,186,994.79 3% Heap Unclassified linux64-qr opt stylo 330,901,427.86 -> 340,734,465.72 You can find links to graphs and comparison views for each of the above tests at: https://treeherder.mozilla.org/perf.html#/alerts?id=14600 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://wiki.mozilla.org/AWSY/Tests

This is expected. It's the result of starting an extra process to host extensions. We've already decided to live with this when we enabled on Windows and OS-X.