Since upgrading to Thunderbird 91 (currently 91.7.0), it consistently takes 5+ minutes to start [Windows 10 Pro x64 v. 21H2], even in Troubleshooting Mode (all extensions disabled). I can see the Disk Active time pegged at 100% in the Task Manager during this time, with little to no CPU usage. I thought my antivirus might be doing some odd scan on the profile folder, but I uninstalled F-Secure Security Suite for AV (rebranded for Spectrum) and that didn't change anything. I set up a Microsoft Defender Antivirus scan Exclusion (Windows Security -> Virus & threat protection -> Virus & threat protection settings -> Manage settings -> Exclusions -> Add or remove exclusions) for my TB profile folder, but that didn't do anything either. I have a heavily-customized profile with 6 email accounts, so I really don't want to have to create another profile, but I guess I will if it comes to that... Any other ideas on how to fix this?
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Are you saving the emails to disk (POP3) or using IMAP?– RamhoundCommented Mar 28, 2022 at 0:00
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@Ramhound all accounts use IMAP, with basically everything locally cached.– BrieCommented Mar 28, 2022 at 0:06
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Mechanical or SSD? These fairly large mailboxes?– RamhoundCommented Mar 28, 2022 at 1:04
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@Ramhound SSD - 1 mailbox is particularly large - %profile%\ImapMail\ is 4.3GB– BrieCommented Mar 28, 2022 at 1:48
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1Have you tried performing a compact on your messages?– RamhoundCommented Mar 28, 2022 at 2:33
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