Did you try compact your email? or repair your folder?

• In the Menu bar(Press F10 or Alt to unhide) go to File >> Compact folders
• Right click on the folder select Properties >> Rapair folder

Did you try create a new profile?

• New profile

I've downloaded the link for profiles, but nothing will come up. Can't get to site to add a new profile. Any ideas? tried compacting the folder, disabling McAfee, no help

OK so I figured out I needed to create a profile in Mozilla not Thunderbird (I guess, as I cannot figure out how to find profiles within TB) How does that help me in Thunderbird? How do I copy all email folders so I can try a re-install on TB? What about Thunderfix? I don't want to "fix" until I've got all my e-mails saved. Thanks

So I tried all the fixes and nothing helped at all. I finally realized that onoly my inbox was affected, so I went thru tediously and deleted all e-mail that I didn't need (FWIW-sort them by name, then delete en masse). Got down to about 1200 or so, then moved all of them into a new folder I called inbox1. Now when new mail comes in I can delete it immediately with out having to wait. So far it's working-we'll see.

Your problem is almost certainly related to McAfee. And it probably is just a matter of time it comes back. Check this article.

https://wiki.mozilla.org/Thunderbird:Testing:Antivirus_Related_Performance_Issues#McAfee

I can't find any of those areas is McAfee. Maybe they were in the McAfee Security Plus program I deleted

I don't think anyone here uses McAfee. So better ask in a McAfee forum.

I will do that. In the mean time, I went into my sent folder that had 3900+ emails in it and it also was very slow, none of my other folders is slow. I deleted all the irrelevant emails from the sent folder, and it now works fine. Could this be a memory issue?

If it recurs, I'll remove MCAfee and install Nod32. Thanks

FWIW- everything worked well for a while, the pfffst!. OK, Uninstalled MA and installed a trial nod 32. No issues so far.