1651767 - Huge spike in memory and processor usage when opening a new tab

Status: RESOLVED WORKSFORME

(Core :: Performance, defect)

Description

[ZeeGee]

Attachment: memory-report.json.gz

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:80.0) Gecko/20100101 Firefox/80.0

Steps to reproduce:

1. Start Firefox
2. Go browse some pages (open like 4 tabs)
3. Wait around 2 min
4. Open a new tab and go to a website (I tried Wikipedia)

Actual results:

2. Memory used is higher than usual
3. Huge spike in memory and processor

Expected results:

No spike of memory and processor

Comment 1

[ZeeGee]

Attachment: about - support.txt

Comment 2

[ZeeGee]

I added the about:support copy/paste data in the .txt. Don't hesitate to ask me more data, I can also live-share also my screen if needed.
It's actually pretty bad and critical bug, I can't use Nightly a lot before my fan goes crazy.

Comment 3

[Andrew McCreight [:mccr8]]

I'll try to take a look at the memory report today.

Comment 4

[Andrew McCreight [:mccr8]]

This from the main process looks a little high:
104.10 MB (19.56%) -- startup-cache

This also seems like a lot, but maybe it is normal:
├───35.29 MB (06.63%) -- images
│ ├──34.51 MB (06.48%) -- chrome
│ │ ├──34.34 MB (06.45%) -- vector/used/progress=18f
│ │ │ ├──27.66 MB (05.20%) -- image(0x0, chrome://browser/skin/tabbrowser/loading-burst.svg)

Generally, though, the memory usage doesn't look that high to me, from the memory report.

Maybe a profiler report would be more useful?

I've tried to make the summary a bit more specific.

Comment 5

[ZeeGee]

Thank you for investigating it. I don't know if the memory is enough to investigate, given it happens a a few times: spike and then going down.
Last update make things better, I should see for the next days (till Friday) and tell if it's back to normal.

Comment 6

[ZeeGee]

It looks good now. I'm closing it.

Comment 7

[Andrew McCreight [:mccr8]]

Thanks for the update. I'm glad your problem went away.