Closed Bug 1986616 Opened 10 months ago Closed 9 months ago

9.4% amazon largestContentfulPaint (Linux) regression on Mon August 25 2025

Categories

(Core :: Printing: Output, defect)

Product:
Core
Component:
Printing: Output
Type:
defect

Tracking

()

Status:
RESOLVED WONTFIX
Tracking Flags:
Tracking Status
firefox-esr128 --- unaffected
firefox-esr140 --- unaffected
firefox142 --- wontfix
firefox143 --- wontfix
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 fa5150f4a96a5160bb0813d921d5ef4c50067f53. 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 aesanu@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
9% amazon largestContentfulPaint linux1804-64-shippable-qr fission warm webrender 267.98 -> 293.17 Before/After

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 aesanu@mozilla.com to do that for you.

You can run all of these tests on try with ./mach try perf --alert 46491

The following documentation link provides more information about this command.

Flags: needinfo?(emilio)

Set release status flags based on info from the regressing bug 1984884

status-firefox142: --- → affected
status-firefox143: --- → affected
status-firefox144: --- → affected
status-firefox-esr128: --- → unaffected
status-firefox-esr140: --- → unaffected

My understanding is that the same patch, among other things, also improved amazon and booking perceptualspeedindex and co, from bug 1977839, right? If so this doesn't seem particularly concerning.

Flags: needinfo?(emilio) → needinfo?(aesanu)

(In reply to Emilio Cobos Álvarez (:emilio) from comment #2)

My understanding is that the same patch, among other things, also improved amazon and booking perceptualspeedindex and co, from bug 1977839, right? If so this doesn't seem particularly concerning.

That is right.

Flags: needinfo?(aesanu)
Status: NEW → RESOLVED
Closed: 9 months ago
Resolution: --- → WONTFIX
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