1626974 - Very long (continuous?) CC cycle hoses browser

Status: RESOLVED INCOMPLETE

(Core :: XPCOM, defect)

Description

[James Willcox (:snorp) ([e-mail]) (he/him)]

My wife is trying to use Firefox on Mac to watch lectures, and the browser becomes unresponsive quickly after the videos start. Unfortunately I can't share the URL because it needs auth, but they appear to be using a system called Slidespiel (https://slidespiel.com/).

I was able to pull a profile (https://perfht.ml/2xGtVYz) which shows nsCycleCollector_collectSlice occupying all time in the content process (more than 13s).

Comment 1

[Andrew McCreight [:mccr8]]

What does about:memory look like? The most common cause of long CC times in ghost windows (eg leaked windows), though usually those require time to accumulate.

Comment 2

[James Willcox (:snorp) ([e-mail]) (he/him)]

I'm not able to take a measurement. Chrome and Safari also choke similarly on this page, so I think the content is just doing something pathological.

Comment 3

[Firefox Bug Husbandry Bot]

Because this bug's Severity has not been changed from the default since it was filed, and it's Priority is -- (Backlog,) indicating it has has not been previously triaged, the bug's Severity is being updated to -- (default, untriaged.)

Comment 4

[Andrew McCreight [:mccr8]]

Hard to know what to do here.