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Thunderbird 91 now takes > 5 min to start

  • 9 replies
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  • Last reply by sfhowes

cgtyoder
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?

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?

All Replies (9)

sfhowes
sfhowes
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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

cgtyoder
cgtyoder Question owner
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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.)

cgtyoder
cgtyoder Question owner
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Ok finally getting around to troubleshooting this. I uninstalled F-Secure Security Suite for AV and it is still happening. This is incredibly frustrating. What is causing this massive delay?

sfhowes
sfhowes
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Long startups might be due to several accounts, address books or calendars that sync at startup. Perhaps test with a separate profile, and add one account. If it starts normally, keep adding accounts, calendars etc. and see if the startup delay increases significantly at some point. Help/More Troubleshooting, about:profiles, to create and manage profiles.

cgtyoder
cgtyoder Question owner
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I can see that the C: disk Active Time is pegged solid at 100% in Task Manager during those 5 minutes - something is being scanned.

sfhowes
sfhowes
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Is this with the original profile or a new one? If you currently have Windows Defender as the AV, add the TB profile folder as an Exclusion.

cgtyoder
cgtyoder Question owner
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This is with the original profile. In Windows Security -> Virus & threat protection -> Exclusions:Add or remove exclusions, I excluded c:\Users\cgtyoder\AppData\Roaming\Thunderbird\Profiles\43c9y4rt437.default-release\ (that last dir name is made up but you get the idea).

cgtyoder
cgtyoder Question owner
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I really don't want to create a new profile, as I have heavily customized this profile, with 6 email accounts. But I will grudgingly do so if that is the last available option.

sfhowes
sfhowes
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Without knowing the details of your setup, it's difficult to offer specific advice. I suggest you work through this list to see if any of the items apply:

https://wiki.mozilla.org/Thunderbird:Testing:Memory_Usage_Problems