Perfherder has detected a awsy performance regression from push 9bcf68d2c0df4b5910ae8f96299a2ff9291720bf. As author of one of the patches included in that push, we need your help to address this regression.

Regressions:

2% Images linux1804-64-shippable-qr opt tp6 8,684,081.56 -> 8,859,171.60
0.33% Base Content JS linux1804-64-shippable opt 3,697,452.00 -> 3,709,743.33
0.33% Base Content JS linux1804-64-shippable-qr opt 3,697,658.00 -> 3,709,844.67
0.32% Base Content JS macosx1014-64-shippable opt 3,704,385.00 -> 3,716,092.00
0.32% Base Content JS windows10-64-shippable-qr opt 3,763,667.33 -> 3,775,614.67
0.31% Base Content JS linux1804-64-shippable-qr opt 3,698,409.67 -> 3,709,852.67
0.31% Base Content JS windows10-64-shippable-qr opt 3,764,430.33 -> 3,776,116.00
0.27% Base Content JS windows10-64-shippable opt 3,764,316.00 -> 3,774,545.33

Details of the alert can be found in the alert summary, including links to graphs and comparisons for each of the affected tests. Please follow our guide to handling regression bugs and let us know your plans within 3 business days, or the offending patch(es) will be backed out in accordance with our regression policy.

For more information on performance sheriffing please see our FAQ.

The patch introduces a new feature that requires some self-hosted code. There will be more to come.

Bug 1458339 looks to share self-hosted code across all processes, which would eliminate all of this.