Hm, we don't suffer any actual slowdown, it's just that the number of processes increases over time.It's not a slowdown - the client connects, and hangs. It never even gets to the authentication phase (at least it's not logged). Clients that happen to connect to a non-affected process run normally.
Well, that just sounds like you're running out of entropy. That's a different issue. Recompile your cyrus-sasl to use /dev/urandom instead of /dev/random or disable apop in /etc/imapd.conf:
allowapop: 0
Either of those things should get rid of that.
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