thunderbird 128.2.3 (since 128.0) hangs and gives no feedback after fetching mails from an account

[ulimuc]

thunderbird 128.2.3 (since 128.0), also latest Windows 10, hangs and gives no feedback after fetching mails from an account

[ulimuc]

and it is downloading some of the received mails several times identical

[ulimuc]

or is it just so incredibly slow now...?