Bug: 2.78 - 2.51% google-mail loadtime / google-mail loadtime (Linux) regression on Thu October 17 2024
Status: RESOLVED
Priority: --
Resolution: FIXED
Created: 2024-10-25 12:38:48+00:00
Resolved: 2024-11-11 10:37:07+00:00

Perfherder has detected a browsertime performance regression from push [df020056819341b4115a98713ce4585d60eb8252](https://hg.mozilla.org/integration/autoland/pushloghtml?changeset=df020056819341b4115a98713ce4585d60eb8252). 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** | 
|--|--|--|--|--|--| 
| [3%](https://treeherder.mozilla.org/perfherder/graphs?timerange=1209600&series=autoland,3776843,1,13)  | [google-mail](https://firefox-source-docs.mozilla.org/testing/perfdocs/raptor.html#google-mail-d) loadtime | linux1804-64-shippable-qr | fission warm webrender | 375.69 -> 386.13 | [Before](https://profiler.firefox.com/from-url/https%3A%2F%2Ffirefox-ci-tc.services.mozilla.com%2Fapi%2Fqueue%2Fv1%2Ftask%2FGg2PMQK1QmCUu3M0edeJ4A%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_google-mail.zip)/[After](https://profiler.firefox.com/from-url/https%3A%2F%2Ffirefox-ci-tc.services.mozilla.com%2Fapi%2Fqueue%2Fv1%2Ftask%2FM2MEddQMSpeULXyIRuJLQQ%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_google-mail.zip) |
| [3%](https://treeherder.mozilla.org/perfherder/graphs?timerange=1209600&series=autoland,3776843,1,13)  | [google-mail](https://firefox-source-docs.mozilla.org/testing/perfdocs/raptor.html#google-mail-d) loadtime | linux1804-64-shippable-qr | fission warm webrender | [376.26](https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/Gg2PMQK1QmCUu3M0edeJ4A/runs/0/artifacts/public/test_info/browsertime-results.tgz) -> [385.70](https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/M2MEddQMSpeULXyIRuJLQQ/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%2FGg2PMQK1QmCUu3M0edeJ4A%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_google-mail.zip)/[After](https://profiler.firefox.com/from-url/https%3A%2F%2Ffirefox-ci-tc.services.mozilla.com%2Fapi%2Fqueue%2Fv1%2Ftask%2FM2MEddQMSpeULXyIRuJLQQ%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_google-mail.zip) |


Details of the alert can be found in the [alert summary](https://treeherder.mozilla.org/perfherder/alerts?id=2689), 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.

You can run all of these tests on try with `./mach try perf --alert 2689`

The following [documentation link](https://firefox-source-docs.mozilla.org/testing/perfdocs/mach-try-perf.html#running-alert-tests) provides more information about this command.

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

If you have any questions, please do not hesitate to reach out to bacasandrei@mozilla.com.