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Thunderbird 91 now takes > 5 min to start

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  • 1 has this problem
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  • 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.

https://support.microsoft.com/en-us/windows/start-your-pc-in-safe-mode-in-windows-10-92c27cff-db89-8644-1ce4-b3e5e56fe234

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

https://help.f-secure.com/product.html?business/computer-protection-windows/latest/en/task_13205052E3D44C44BA2491A55A7F818F-latest-en

Helpful?

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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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