1651555 - Massive slowdown when loading old reddit with Fission enabled

Status: VERIFIED DUPLICATE of bug 1650629

(Core :: Performance: General, defect)

Description

[Asif Youssuff]

Attachment: memory-report.json-2020-07-08.gz

Noticed today while browsing the web in Firefox that reddit tabs specifically took a long time compared to other sites.

Basic information

Steps to Reproduce:

1. Enable Fission
2. Browse for a few hours; memory usage will be high
3. Load https://old.reddit.com/r/firefox/

Expected Results:

Reddit takes a similar time to load as other pages (5 seconds or so).

Actual Results:

Reddit takes a minute or more to load, with high jank (can't scroll or open other tabs).

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More information

Profile URL: https://drive.google.com/file/d/1OwPejZJdzPzYw_4IhCl_LVl4ZoWrhTyp/view?usp=sharing

Also attaching a memory report from the same session.

Basic systems configuration:

OS version:

GPU model: Ubuntu 20.10

Number of cores: 4

Amount of memory (RAM): 24GB RAM

Thanks so much for your help.

Comment 1

[Asif Youssuff]

Attachment: about:support

Comment 2

[Asif Youssuff]

The situation improves immensely after disabling Fission. No add-ons enabled, FWIW.