Dovecot and imapproxy

[Grant]

imapproxy sped things up a lot for me when I was using courier.  I
switched to dovecot a while back and kept using imapproxy.  Lately
I've been noticing weird TCP Queuing spikes in my munin graphs and
discontinuing my use of imapproxy seems to have smoothed them out
completely and I haven't noticed a slowdown in webmail.  Is imapproxy
generally not necessary with dovecot?

- Grant