[Dovecot] Dovecot very slow on a mailbox with > 700 IMAP Folders

[Timo Sirainen]

On 5.5.2011, at 10.04, Becker, Ronny wrote:

> I did some debugging and found that a lsub "" "*" that is used by Thunderbird takes > 5 minutes.

Something's very wrong. I just tested with 1000 folders in a subscriptions file and it lists it in less than a second.

> I did some debugging with strace, too. It's about 22MB only for running the lsub command !?

Run it with strace -tt and send me the output compressed?

Also dovecot -n output could be useful.