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Thunderbird 91 now takes > 5 min to start

  • 2 replies
  • 1 has this problem
  • Last reply by cgtyoder

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Since upgrading to TB 91 (currently 91.2.0), it consistently takes 5+ minutes to start [Windows 10 Pro x64 v. 21H1], even in Safe Mode (all extensions disabled). I can see the Disk Active time pegged at 100% in the Task Manager during this time, but little to no CPU usage. I am using F-Secure Security Suite for AV (rebranded for Spectrum). Suggestions as to how to fix this?

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Try running Windows in safe mode to see if startup apps like F-Secure are causing the delay.

The general recommendation is to exclude the TB profile folder from AV scanning.


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I added my TB profile folder to the F-Secure AV excluded folders - didn't help. Still takes several minutes to start up. (Also updated to 91.2.1.)


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