Bug: 17.85% espn ContentfulSpeedIndex (OSX) regression on Fri October 13 2023
Status: RESOLVED
Priority: --
Resolution: DUPLICATE
Created: 2023-10-31 14:10:14+00:00
Resolved: 2024-11-15 18:44:20+00:00

Perfherder has detected a browsertime performance regression from push [9ba44fb4eeafba4229fe28a6f3b42c79d8d05692](https://hg.mozilla.org/integration/autoland/pushloghtml?changeset=9ba44fb4eeafba4229fe28a6f3b42c79d8d05692). 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** | 
|--|--|--|--|--|--| 
| [18%](https://treeherder.mozilla.org/perfherder/graphs?timerange=2592000&series=autoland,3779887,1,13)  | [espn](https://firefox-source-docs.mozilla.org/testing/perfdocs/raptor.html#espn-d) ContentfulSpeedIndex | macosx1015-64-shippable-qr | cold fission webrender | [757.69](https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/a5imjEDbRuOp33DArSg7gw/runs/0/artifacts/public/test_info/browsertime-results.tgz) -> [892.94](https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/a6jzMcXOTn6DJRRQYmeBAg/runs/0/artifacts/public/test_info/browsertime-results.tgz) | [Before](https://profiler.firefox.com/from-url/https%3A%2F%2Ffirefox-ci-tc.services.mozilla.com%2Fapi%2Fqueue%2Fv1%2Ftask%2Fa5imjEDbRuOp33DArSg7gw%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_espn.zip)/[After](https://profiler.firefox.com/from-url/https%3A%2F%2Ffirefox-ci-tc.services.mozilla.com%2Fapi%2Fqueue%2Fv1%2Ftask%2Fa6jzMcXOTn6DJRRQYmeBAg%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_espn.zip) |
### Improvements:

| **Ratio** | **Test** | **Platform** | **Options** | **Absolute values (old vs new)** |  **Performance Profiles** | 
|--|--|--|--|--|--| 
| [14%](https://treeherder.mozilla.org/perfherder/graphs?timerange=2592000&series=autoland,3779885,1,13)  | [espn](https://firefox-source-docs.mozilla.org/testing/perfdocs/raptor.html#espn-d) FirstVisualChange | macosx1015-64-shippable-qr | cold fission webrender | 624.20 -> 535.58 | [Before](https://profiler.firefox.com/from-url/https%3A%2F%2Ffirefox-ci-tc.services.mozilla.com%2Fapi%2Fqueue%2Fv1%2Ftask%2Fa5imjEDbRuOp33DArSg7gw%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_espn.zip)/[After](https://profiler.firefox.com/from-url/https%3A%2F%2Ffirefox-ci-tc.services.mozilla.com%2Fapi%2Fqueue%2Fv1%2Ftask%2Fa6jzMcXOTn6DJRRQYmeBAg%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_espn.zip) |
| [2%](https://treeherder.mozilla.org/perfherder/graphs?timerange=2592000&series=autoland,3778129,1,13)  | [google-docs](https://firefox-source-docs.mozilla.org/testing/perfdocs/raptor.html#google-docs-d) ContentfulSpeedIndex | windows10-64-shippable-qr | fission warm webrender | 780.75 -> 761.95 | [Before](https://profiler.firefox.com/from-url/https%3A%2F%2Ffirefox-ci-tc.services.mozilla.com%2Fapi%2Fqueue%2Fv1%2Ftask%2FaMq8MkHtTs2Cr4EM5qYJPg%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_google-docs.zip)/[After](https://profiler.firefox.com/from-url/https%3A%2F%2Ffirefox-ci-tc.services.mozilla.com%2Fapi%2Fqueue%2Fv1%2Ftask%2FRstEUJ_sQk-79PrQHC0jBQ%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_google-docs.zip) |


Details of the alert can be found in the [alert summary](https://treeherder.mozilla.org/perfherder/alerts?id=39977), 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 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).