6.79 - 6.79% youtube-watch FirstVisualChange / youtube-watch FirstVisualChange (Android) regression on Mon August 25 2025
Categories
(Core :: WebRTC, defect)
Tracking
()
| Tracking | Status | |
|---|---|---|
| firefox-esr128 | --- | unaffected |
| firefox-esr140 | --- | unaffected |
| firefox142 | --- | unaffected |
| firefox143 | --- | fix-optional |
| firefox144 | --- | affected |
People
(Reporter: intermittent-bug-filer, Unassigned)
References
(Regression)
Details
(Keywords: perf, perf-alert, regression)
Perfherder has detected a browsertime performance regression from push 1ee33e211b595a8eb15ca34d2051bd9711f943bb. 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. Our guide to handling regression bugs 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 afinder@mozilla.com. Alternatively, you can find help on Slack by joining #perf-help, and on Matrix you can find help by joining #perftest.
Regressions:
| Ratio | Test | Platform | Options | Absolute values (old vs new) | Performance Profiles |
|---|---|---|---|---|---|
| 7% | youtube-watch ContentfulSpeedIndex | android-hw-a55-14-0-aarch64-shippable | cold fission webrender | 653.83 -> 698.21 | |
| 7% | youtube-watch FirstVisualChange | android-hw-a55-14-0-aarch64-shippable | cold fission webrender | 652.24 -> 696.52 |
Details of the alert can be found in the alert summary, 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 or ask afinder@mozilla.com to do that for you.
You can run all of these tests on try with ./mach try perf --alert 46506
The following documentation link provides more information about this command.
|
||
Updated•6 months ago
|
|
||
Comment 1•6 months ago
|
||
Set release status flags based on info from the regressing bug 1981040
|
||
Comment 2•6 months ago
|
||
https://bugzilla.mozilla.org/show_bug.cgi?id=1980299 seems a lot more likely in that range?
|
||
Comment 3•6 months ago
|
||
The automatically identified revision is unlikely to be related.
|
|
||
Comment 4•5 months ago
|
||
(In reply to Ryan VanderMeulen [:RyanVM] from comment #2)
https://bugzilla.mozilla.org/show_bug.cgi?id=1980299 seems a lot more likely in that range?
Thanks for the reply Ryan! The bug pointed out cannot be the culprit, since it landed more than a month ago and the regression is more recent.
Looking at the graph, it seems the numbers have dropped to the trend before the regression landed. Also, the graph shows an infra pattern on retriggers, so I'll mark the alert summary accordingly, and close the bug as INVALID.
Description
•