Bug: 18.13 - 9.12% google-search loadtime / bing-search LastVisualChange (OSX, Windows) regression on Wed July 26 2023
Status: RESOLVED
Priority: --
Resolution: FIXED
Created: 2023-08-02 19:22:44+00:00
Resolved: 2023-08-16 17:59:54+00:00

Perfherder has detected a browsertime performance regression from push [1316e023af4411c289e2fe2c7d2d73d9b1ac3fb0](https://hg.mozilla.org/integration/autoland/pushloghtml?changeset=1316e023af4411c289e2fe2c7d2d73d9b1ac3fb0). 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=1209600&series=autoland,3779231,1,13)  | [google-search](https://firefox-source-docs.mozilla.org/testing/perfdocs/raptor.html#google-search-d) loadtime | macosx1015-64-shippable-qr | cold fission webrender | [469.16](https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/Br_Qr4J-Qem0EIECd4LZQw/runs/0/artifacts/public/test_info/browsertime-results.tgz) -> [554.20](https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/UWEW_5ZISduWkcownxYs3w/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%2FBr_Qr4J-Qem0EIECd4LZQw%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_google-search.zip)/[After](https://profiler.firefox.com/from-url/https%3A%2F%2Ffirefox-ci-tc.services.mozilla.com%2Fapi%2Fqueue%2Fv1%2Ftask%2FUWEW_5ZISduWkcownxYs3w%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_google-search.zip) |
| [9%](https://treeherder.mozilla.org/perfherder/graphs?timerange=1209600&series=autoland,4405717,1,13)  | [bing-search](https://firefox-source-docs.mozilla.org/testing/perfdocs/raptor.html#bing-search-d) LastVisualChange | windows10-64-shippable-qr | bytecode-cached cold fission webrender | [753.84](https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/TAtth16BRzahbqNMtyvTKQ/runs/0/artifacts/public/test_info/browsertime-results.tgz) -> [822.57](https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/RWBf_u3JRM-0mVTCU96eEg/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%2FTAtth16BRzahbqNMtyvTKQ%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_bing-search.zip)/[After](https://profiler.firefox.com/from-url/https%3A%2F%2Ffirefox-ci-tc.services.mozilla.com%2Fapi%2Fqueue%2Fv1%2Ftask%2FRWBf_u3JRM-0mVTCU96eEg%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_bing-search.zip) |


Details of the alert can be found in the [alert summary](https://treeherder.mozilla.org/perfherder/alerts?id=39165), 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).