Bug: 5.93 - 4.31% welcome ContentfulSpeedIndex / welcome ContentfulSpeedIndex + 4 more (Linux, OSX, Windows) regression on Wed December 14 2022
Status: RESOLVED
Priority: P1
Resolution: FIXED
Created: 2022-12-16 13:01:31+00:00
Resolved: 2023-01-04 08:21:52+00:00

Perfherder has detected a browsertime performance regression from push [9456d51620516727a0141b266d55db32b0792ea4](https://hg.mozilla.org/integration/autoland/pushloghtml?changeset=9456d51620516727a0141b266d55db32b0792ea4). 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)** |  **Performance Profiles** | 
|--|--|--|--|--|--| 
| [6%](https://treeherder.mozilla.org/perfherder/graphs?timerange=1209600&series=autoland,3933613,1,13)  | [welcome](https://firefox-source-docs.mozilla.org/testing/perfdocs/raptor.html#welcome-c) ContentfulSpeedIndex | macosx1015-64-shippable-qr | fission warm webrender | 1,219.17 -> 1,291.42 |  |
| [6%](https://treeherder.mozilla.org/perfherder/graphs?timerange=1209600&series=autoland,3937762,1,13)  | [welcome](https://firefox-source-docs.mozilla.org/testing/perfdocs/raptor.html#welcome-c) ContentfulSpeedIndex | linux1804-64-shippable-qr | fission warm webrender | [1,143.00](https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/aMHnWIcCR7K7wU7whoUeUg/runs/0/artifacts/public/test_info/browsertime-results.tgz) -> [1,210.00](https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/RgJPyiwoSR61NOpdDk2gFQ/runs/0/artifacts/public/test_info/browsertime-results.tgz) | [Before](https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/aMHnWIcCR7K7wU7whoUeUg/runs/0/artifacts/public/test_info/profile_welcome.zip)/[After](https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/RgJPyiwoSR61NOpdDk2gFQ/runs/0/artifacts/public/test_info/profile_welcome.zip) |
| [5%](https://treeherder.mozilla.org/perfherder/graphs?timerange=1209600&series=autoland,3914615,1,13)  | [welcome](https://firefox-source-docs.mozilla.org/testing/perfdocs/raptor.html#welcome-c) ContentfulSpeedIndex | windows10-64-shippable-qr | cold fission webrender | [1,160.88](https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/KNGKmwPeQNGn0JFPSoZZzA/runs/0/artifacts/public/test_info/browsertime-results.tgz) -> [1,221.33](https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/CBs8Vh5ZRfaLhvN-aXechQ/runs/0/artifacts/public/test_info/browsertime-results.tgz) | [Before](https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/KNGKmwPeQNGn0JFPSoZZzA/runs/0/artifacts/public/test_info/profile_welcome.zip)/[After](https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/CBs8Vh5ZRfaLhvN-aXechQ/runs/0/artifacts/public/test_info/profile_welcome.zip) |
| [5%](https://treeherder.mozilla.org/perfherder/graphs?timerange=1209600&series=autoland,3937756,1,13)  | [welcome](https://firefox-source-docs.mozilla.org/testing/perfdocs/raptor.html#welcome-c) ContentfulSpeedIndex | linux1804-64-shippable-qr | cold fission webrender | [1,198.17](https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/aMHnWIcCR7K7wU7whoUeUg/runs/0/artifacts/public/test_info/browsertime-results.tgz) -> [1,259.50](https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/RgJPyiwoSR61NOpdDk2gFQ/runs/0/artifacts/public/test_info/browsertime-results.tgz) | [Before](https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/aMHnWIcCR7K7wU7whoUeUg/runs/0/artifacts/public/test_info/profile_welcome.zip)/[After](https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/RgJPyiwoSR61NOpdDk2gFQ/runs/0/artifacts/public/test_info/profile_welcome.zip) |
| [5%](https://treeherder.mozilla.org/perfherder/graphs?timerange=1209600&series=autoland,3914627,1,13)  | [welcome](https://firefox-source-docs.mozilla.org/testing/perfdocs/raptor.html#welcome-c) ContentfulSpeedIndex | windows10-64-shippable-qr | fission warm webrender | [1,158.33](https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/KNGKmwPeQNGn0JFPSoZZzA/runs/0/artifacts/public/test_info/browsertime-results.tgz) -> [1,216.42](https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/CBs8Vh5ZRfaLhvN-aXechQ/runs/0/artifacts/public/test_info/browsertime-results.tgz) | [Before](https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/KNGKmwPeQNGn0JFPSoZZzA/runs/0/artifacts/public/test_info/profile_welcome.zip)/[After](https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/CBs8Vh5ZRfaLhvN-aXechQ/runs/0/artifacts/public/test_info/profile_welcome.zip) |
| [4%](https://treeherder.mozilla.org/perfherder/graphs?timerange=1209600&series=autoland,3933607,1,13)  | [welcome](https://firefox-source-docs.mozilla.org/testing/perfdocs/raptor.html#welcome-c) ContentfulSpeedIndex | macosx1015-64-shippable-qr | cold fission webrender | 1,257.11 -> 1,311.33 |  |


Details of the alert can be found in the [alert summary](https://treeherder.mozilla.org/perfherder/alerts?id=36456), 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).