[tor-bugs] #8560 [Applications/Tor Browser]: 100% CPU usage in Tor Browser?

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#8560: 100% CPU usage in Tor Browser?
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 Reporter:  mikeperry                 |          Owner:  tbb-team
     Type:  defect                    |         Status:  reopened
 Priority:  High                      |      Milestone:
Component:  Applications/Tor Browser  |        Version:
 Severity:                            |     Resolution:
 Keywords:  tbb-firefox-patch         |  Actual Points:
Parent ID:                            |         Points:
 Reviewer:                            |        Sponsor:
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Comment (by speedtester):

 I'm having high cpu usage with version 9.0.1 only when using a profile
 with torlauncher.prompt_at_startup and start_tor set to false, to access
 clearnet or other proxies.
 Tried setting versioncheck_enabled to false, it helped once, but maybe
 I've changed something else too.
 Since ever then, I can't figure out what setting helped, as I can't fix
 the other profiles.
 I've figured out the below 2 threads are the hoggers:
 -firefox.exe!Ordinal0+0x11x0
 -ucrtbase.DLL!o__Clpow+0x10

 Hope it helps.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/8560#comment:22>
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