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 3s).
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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).