Closed Bug 1717214 Opened 3 years ago Closed 3 years ago

Requests spending a lot of time stuck in "Blocked" phase

Categories

(Core :: Performance, defect)

Firefox 91
x86_64
Linux
defect

Tracking

()

RESOLVED DUPLICATE of bug 1717253

People

(Reporter: bz, Unassigned)

References

(Regression)

Details

(Keywords: regression)

Attachments

(1 file)

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0

Steps to reproduce:

  • Visited webpage at uuidgenerator.net and pressed Ctrl+F5 (but this bug seems to affect many sites), waited for page to load

Actual results:

Since the nightly build 2021-06-17 I've noticed that lots of pages are "slow to load" (very vague, I know). Upon investigating in DevTools they're spending a tons of time in the "Blocked" phase (like, upwards of 20000ms).

Profiler: https://share.firefox.dev/2S95DBb

Expected results:

Page should have loaded quickly.

I can reproduce in Troubleshooting Mode. I can't reproduce in a fresh profile. I have TRR enabled.

The Bugbug bot thinks this bug should belong to the 'Core::Performance' component, and is moving the bug to that component. Please revert this change in case you think the bot is wrong.

Component: Untriaged → Performance
Product: Firefox → Core

We can go with Performance if the bot likes the sound of that. I suspect the root cause is something Core::Networky though, tbh.

16:51.35 INFO: Last good revision: 94623c136e66f88f709e8aaf43dc1c556f4881cc
16:51.35 INFO: First bad revision: adf68ff22830f6a0dc94a52e421d916244b3192c
16:51.35 INFO: Pushlog:
https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=94623c136e66f88f709e8aaf43dc1c556f4881cc&tochange=adf68ff22830f6a0dc94a52e421d916244b3192c

Status: NEW → RESOLVED
Closed: 3 years ago
OS: Unspecified → Linux
Regressed by: 1714506
Hardware: Unspecified → x86_64
Resolution: --- → DUPLICATE
Has Regression Range: --- → yes
Keywords: regression
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