Bug: 45.12 - 19.36% twitch SpeedIndex / twitch ContentfulSpeedIndex + 1 more (Linux) regression on Fri October 21 2022
Status: RESOLVED
Priority: --
Resolution: INVALID
Created: 2022-10-28 15:22:48+00:00
Resolved: 2022-11-09 14:26:40+00:00

Perfherder has detected a browsertime performance regression from push [aa1994029eeb1dea523e6862e1efb0d085a908b6](https://hg.mozilla.org/integration/autoland/pushloghtml?changeset=aa1994029eeb1dea523e6862e1efb0d085a908b6). As author of one of the patches included in that push, we need your help to address this regression.

### Regressions:

| **Ratio** | **Test** | **Platform** | **Options** | **Absolute values (old vs new)**| 
|--|--|--|--|--| 
| [45%](https://treeherder.mozilla.org/perfherder/graphs?timerange=1209600&series=autoland,3777140,1,13) | [twitch](https://firefox-source-docs.mozilla.org/testing/perfdocs/raptor.html#twitch-d) SpeedIndex | linux1804-64-shippable-qr | cold fission webrender | [818.08](https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/FiTl8OomRhGuhBSxiQnYtQ/runs/0/artifacts/public/test_info/browsertime-results.tgz) -> [1,187.17](https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/Pte3dbnvShmA9wtLnoZPbg/runs/0/artifacts/public/test_info/browsertime-results.tgz) |
| [38%](https://treeherder.mozilla.org/perfherder/graphs?timerange=1209600&series=autoland,3777145,1,13) | [twitch](https://firefox-source-docs.mozilla.org/testing/perfdocs/raptor.html#twitch-d) PerceptualSpeedIndex | linux1804-64-shippable-qr | cold fission webrender | [660.62](https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/FiTl8OomRhGuhBSxiQnYtQ/runs/0/artifacts/public/test_info/browsertime-results.tgz) -> [913.08](https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/Pte3dbnvShmA9wtLnoZPbg/runs/0/artifacts/public/test_info/browsertime-results.tgz) |
| [19%](https://treeherder.mozilla.org/perfherder/graphs?timerange=1209600&series=autoland,3777143,1,13) | [twitch](https://firefox-source-docs.mozilla.org/testing/perfdocs/raptor.html#twitch-d) ContentfulSpeedIndex | linux1804-64-shippable-qr | cold fission webrender | [1,310.69](https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/FiTl8OomRhGuhBSxiQnYtQ/runs/0/artifacts/public/test_info/browsertime-results.tgz) -> [1,564.43](https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/Pte3dbnvShmA9wtLnoZPbg/runs/0/artifacts/public/test_info/browsertime-results.tgz) |


Details of the alert can be found in the [alert summary](https://treeherder.mozilla.org/perfherder/alerts?id=35835), including links to graphs and comparisons for each of the affected tests. Please follow our [guide to handling regression bugs](https://wiki.mozilla.org/TestEngineering/Performance/Handling_regression_bugs) and **let us know your plans within 3 business days, or the offending patch(es) may be backed out** in accordance with our [regression policy](https://www.mozilla.org/en-US/about/governance/policies/regressions/).

If you need the profiling jobs you can trigger them yourself from treeherder job view or ask a sheriff to do that for you.

For more information on performance sheriffing please see our [FAQ](https://wiki.mozilla.org/TestEngineering/Performance/FAQ).