[Bug 2048792] Re: Firefox utilizing 100% of station CPU

[Nick Hummel]

Hi All,

I'm a developer with Steve's group. Thank you for taking a look at this
and linking to that other bug! I took a look through the profiler
summaries linked in the thread and it appears very similar to what we
are observing. We also captured performance profiles for the current
version of Firefox we're using (100.0.2), and we observed similar
behavior from the Renderer, Compositor, and SwComposite tracks.

Since we are unable to change Firefox version quickly in our use case,
we would like to understand if there are any mitigations or settings we
could modify to prevent these symptoms. The last comment in the linked
bug thread mentions that disabling and re-enabling the Compositor
resolved symptoms, so we will try this out tomorrow. Longer term though,
upgrading the version is absolutely something we're looking at.

In addition to testing changes with the Compositor settings, are there
any parameters we could change in the about:config page? In our initial
testing, we have observed CPU usage vary roughly proportionately with
the layout.frame_rate parameter when these CPU throttling symptoms are
present (default was -1, and when we set to 30 or 15 for example, we see
the CPU usage decrease).

We can also collect additional Firefox profiler results or other logs if
they would help clarify the issue/symptoms.

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Title:
  Firefox utilizing 100% of station CPU

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