1661515 - Reddit and other websites hanging (click something then takes 7 seconds tor more to do the action)

Status: RESOLVED DUPLICATE of bug 1657559

(Core :: JavaScript Engine, defect)

Description

[vxalred]

Attachment: Firefox 2020-08-27 10.58 profile.json.gz

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

Steps to reproduce:

Firefox needs to be open and being used for a period of time (estimate 30 minutes or more) with 5 or more tabs

Actual results:

When browsing websites like Reddit Firefox takes longer than expected to perform an action (click on a post and takes 7 or more seconds and isn't responsive)

Expected results:

Be responsive and perform the action in a reasonable amount of time

Comment 1

[Clara Guerrero ( Need Info Brindusa Tot Please)]

Hi,

Can you please test if the issue occurs to you in safe mode (add-ons disabled). Here is a link that can help you do that:
https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode

Also, try this on the latest version of nightly. You can download it from here: https://nightly.mozilla.org/
Thanks for submitting the profile information.

I will move this over to a component so developers can take a look over it. If is not the correct component please feel free to change it to an appropriate one.

Thanks for the report.

Best regards, Clara.

Comment 2

[Bas Schouten (:bas.schouten)]

This is a JS performance issue, appears to be related to generators. Anything actionable here Ted?

Comment 3

[Ted Campbell [:tcampbell]]

@mgaudet and I took a look at this and it is already fixed in FF81 (though the profile in this bug is from FF80). Bug 1657559.