On 2020-02-11, ml_dove...@thorsten-reichelt.de 
<ml_dove...@thorsten-reichelt.de> wrote:
> I know that there are many results if I search for "dovecot thunderbird
> very slow" on Google but none of them helped me with my problem. :(

Do you have imap compression enabled? I had some problems with that and

> I just don't know where to look for the cause right now, but I can
> provide configurations (like output of |doveadm config) |and some logfile=

Providing any non-default config is usually helpful.

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