Bug 1956655 Comment 5 Edit History

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Original comment by

Florin Bilt

on 2025-04-07 04:34:50 PDT

(In reply to Narcis Beleuzu [:NarcisB] from comment #3)
> https://hg.mozilla.org/mozilla-central/rev/bbbc53f6330f


Perfherder has detected a browsertime performance change from push [bbbc53f6330ff032a11d82683972751a2c1d1b2c](https://hg.mozilla.org/integration/autoland/pushloghtml?changeset=bbbc53f6330ff032a11d82683972751a2c1d1b2c). As author of one of the patches included in that push, we need your help to address this regression.

Please **acknowledge, and begin investigating this alert 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/). Our [guide to handling regression bugs](https://firefox-source-docs.mozilla.org/testing/perfdocs/perftest-in-a-nutshell.html#help-i-have-a-regression-what-do-i-do) has information about how you can proceed with this investigation.

If you have any questions or need any help with the investigation, please reach out to a performance sheriff. Alternatively, you can find help on Slack by joining [#perf-help](https://mozilla.enterprise.slack.com/archives/C03U19JCSFQ), and on Matrix you can find help by joining [#perftest](https://matrix.to/#/#perftest:mozilla.org).

### Regressions:

| **Ratio** | **Test** | **Platform** | **Options** | **Absolute values (old vs new)** |  **Performance Profiles** | 
|--|--|--|--|--|--| 
| [6%](https://treeherder.mozilla.org/perfherder/graphs?timerange=1209600&series=autoland,5256831,1,13)  | [speedometer](https://firefox-source-docs.mozilla.org/testing/perfdocs/raptor.html#speedometer-b) Inferno-TodoMVC/Adding100Items/Async | windows11-64-24h2-shippable | fission webrender | 1.37 -> 1.45 |  |
### Improvements:

| **Ratio** | **Test** | **Platform** | **Options** | **Absolute values (old vs new)** |  **Performance Profiles** | 
|--|--|--|--|--|--| 
| [20%](https://treeherder.mozilla.org/perfherder/graphs?timerange=1209600&series=autoland,5258627,1,13)  | [addkBLN](https://firefox-source-docs.mozilla.org/testing/perfdocs/raptor.html#addkBLN-d) time_duration | windows11-64-24h2-shippable | fission webrender | 2,999.02 -> 2,387.32 | [Before](https://profiler.firefox.com/from-url/https%3A%2F%2Ffirefox-ci-tc.services.mozilla.com%2Fapi%2Fqueue%2Fv1%2Ftask%2FLtKhIZ3xRaeurwGAcijaQg%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_addkBLN.zip)/[After](https://profiler.firefox.com/from-url/https%3A%2F%2Ffirefox-ci-tc.services.mozilla.com%2Fapi%2Fqueue%2Fv1%2Ftask%2FWYZb08nsQ1yaGUoDrn3uQw%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_addkBLN.zip) |
| [8%](https://treeherder.mozilla.org/perfherder/graphs?timerange=1209600&series=autoland,5258079,1,13)  | [ares6](https://firefox-source-docs.mozilla.org/testing/perfdocs/raptor.html#ares6-b)  | windows11-64-24h2-shippable | fission webrender | 14.54 -> 13.32 | [Before](https://profiler.firefox.com/from-url/https%3A%2F%2Ffirefox-ci-tc.services.mozilla.com%2Fapi%2Fqueue%2Fv1%2Ftask%2FNMv24qOcR3yfvOE-tViNeA%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_ares6.zip)/[After](https://profiler.firefox.com/from-url/https%3A%2F%2Ffirefox-ci-tc.services.mozilla.com%2Fapi%2Fqueue%2Fv1%2Ftask%2FXjYCWLaDSSOXYgaKKfPgqg%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_ares6.zip) |
| [3%](https://treeherder.mozilla.org/perfherder/graphs?timerange=1209600&series=autoland,5314864,1,13)  | [jetstream3](https://firefox-source-docs.mozilla.org/testing/perfdocs/raptor.html#jetstream3-d)  | windows11-64-24h2-shippable | fission webrender | 168.94 -> 173.85 | [Before](https://profiler.firefox.com/from-url/https%3A%2F%2Ffirefox-ci-tc.services.mozilla.com%2Fapi%2Fqueue%2Fv1%2Ftask%2FNbg0fISdQ8mb3SrJxvj33w%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_jetstream3.zip)/[After](https://profiler.firefox.com/from-url/https%3A%2F%2Ffirefox-ci-tc.services.mozilla.com%2Fapi%2Fqueue%2Fv1%2Ftask%2FbsqF2XRQTIu4i5OmMO3B1w%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_jetstream3.zip) |
| [2%](https://treeherder.mozilla.org/perfherder/graphs?timerange=1209600&series=autoland,5260328,1,13)  | [jetstream2](https://firefox-source-docs.mozilla.org/testing/perfdocs/raptor.html#jetstream2-b)  | windows11-64-24h2-shippable | fission webrender | 233.16 -> 238.16 | [Before](https://profiler.firefox.com/from-url/https%3A%2F%2Ffirefox-ci-tc.services.mozilla.com%2Fapi%2Fqueue%2Fv1%2Ftask%2FVZwMdpl_SAmz3IqarYqbmw%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_jetstream2.zip)/[After](https://profiler.firefox.com/from-url/https%3A%2F%2Ffirefox-ci-tc.services.mozilla.com%2Fapi%2Fqueue%2Fv1%2Ftask%2FEBnYL-pGQNCk1qB-2tT6xw%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_jetstream2.zip) |
| [2%](https://treeherder.mozilla.org/perfherder/graphs?timerange=1209600&series=autoland,5256691,1,13)  | [sunspider](https://firefox-source-docs.mozilla.org/testing/perfdocs/raptor.html#sunspider-b)  | windows11-64-24h2-shippable | fission webrender | 64.04 -> 62.75 | [Before](https://profiler.firefox.com/from-url/https%3A%2F%2Ffirefox-ci-tc.services.mozilla.com%2Fapi%2Fqueue%2Fv1%2Ftask%2FOfqaebWDSra0iBBUzvwxgg%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_sunspider.zip)/[After](https://profiler.firefox.com/from-url/https%3A%2F%2Ffirefox-ci-tc.services.mozilla.com%2Fapi%2Fqueue%2Fv1%2Ftask%2FDghJk5XPQ7udxYAVJvE1Ig%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_sunspider.zip) |


Details of the alert can be found in the [alert summary](https://treeherder.mozilla.org/perfherder/alerts?id=44584), including links to graphs and comparisons for each of the affected tests.

If you need the profiling jobs [you can trigger them yourself from treeherder job view](https://firefox-source-docs.mozilla.org/testing/perfdocs/perftest-in-a-nutshell.html#using-the-firefox-profiler) or ask a performance sheriff to do that for you.

You can run all of these tests on try with `./mach try perf --alert 44584`

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.