Thunderbird - something in last update (128.4.3esr (64-bit)) gone wrong

[Doblerc]

I am an user of thunderbird from the early versions, but the last update (128.4.3esr (64-bit)) make thunderbird almost unusable. Every email I open, every email I delete, thunderbird has "to think" something and the app freezes and almost clses, and this is with every email. I don't have time to waste, and make me sad that this happens.

[Dan303]

Same here.  Virtually unusable.
How to I downgrade back one version?

[lizb01]

same here! 

[lizb01]

ok - so I spent hours forcing an archive of all my inbox up until the last 12 months, and tbird speed is much improved.. still a bit laggy when deleting or moving or even lookin at an email, but much better than this morning when it was virtually unusable.  What has Mozilla done?  I used to advise many businesses that they were better off with Tbird as it didn't care how many GB of emails you had in your folder (so long as not IMAP); it was still super fast.  So now, with the new version, it seems that unless you have a very tidy inbox (hard when you receive 100 plus emails a day) then you can expect tbird to be horrendously slow.  Please undo whatever 'enhancement' you did.