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Slow Thunderbired email retrieval in Windows 11

Thunderbird Nedbrud og langsom ydelse
Wayne Mery replied
RJBuy
RJBuy

I have 2 Windows 11 laptops running Thunderbird. Retrieval of POP3 account email takes 10 times longer on Windows 11 as compared with Windows 7. I have 13 different email accounts. If there is nothing new to download, my windows 7 computer takes 5 seconds to check all account. Windows 11 takes 50 seconds for the same task... clunking along very much slower. I have tried many approaches to tracking down the cause of the slowness. Antivirus software (Norton 360) and various Thunderbird and system settings. Nothing makes any noticeable difference. I'm at a loss for what to try or even to finding anyone discussing the same issue. I have been using Thunderbird on at least 4 windows 7 pcs with no such issue. Both my windows laptops have the same clunky slowness. I want to move to windows 11, but this is holding me back. Is this just inherent to Windows 11? Any ideas would be appreciated. Thanks

I have 2 Windows 11 laptops running Thunderbird. Retrieval of POP3 account email takes 10 times longer on Windows 11 as compared with Windows 7. I have 13 different email accounts. If there is nothing new to download, my windows 7 computer takes 5 seconds to check all account. Windows 11 takes 50 seconds for the same task... clunking along very much slower. I have tried many approaches to tracking down the cause of the slowness. Antivirus software (Norton 360) and various Thunderbird and system settings. Nothing makes any noticeable difference. I'm at a loss for what to try or even to finding anyone discussing the same issue. I have been using Thunderbird on at least 4 windows 7 pcs with no such issue. Both my windows laptops have the same clunky slowness. I want to move to windows 11, but this is holding me back. Is this just inherent to Windows 11? Any ideas would be appreciated. Thanks

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Wayne Mery
Wayne Mery
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It's not Windows. (I predict) You are using different versions of Thunderbird. Your windows 11 is likely using Thunderbird 140esr or 151.0, which has a change to pop which serializes mail fetches for pop accounts.

Windows 7 is not supported by those versions https://www.thunderbird.net/en-US/thunderbird/140.0/system-requirements/ and is likely running a two year old version 115, which does not have this change to pop.

On Windows 11:

  • Do you have the non-default setting of keeping messages on the pop server?
  • Have you set an exclusion for the Thunderbird profile directory in your AV software?
  • Are you running more than one AV software (including Defender)?
Wayne Mery
Wayne Mery
  • Top 25 Contributor
  • Moderator

p.s. are you using global Inbox, where multiple accounts are putting their messages in the same Inbox? (also called deferred account - not the same as Unified Inbox)

Wayne Mery
Wayne Mery
  • Top 25 Contributor
  • Moderator

p.p.s do you have automatic compact enabled (which is the default) or message retention set in any folder settings or in account settings > disk space > retention policy?

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