[Gllug] courier slow

[countd]

Hello all
I have an issue with courier-imap (4.1.1) on our local network. It is
working but it's incredibly slow, even smallish text messages can take
5-6 seconds to show up in the mail client (Thunderbird) after clicking
- much slower than I'd expect, and messages with small (less than 1MB)
attachments take ages to download.

Thing is, the server isn't exactly breaking sweat (load avg 0.02 at
one stage during testing, but the mail still slow), and the network
traffic is fairly low (30-300 KB/s on average), so my question really
is, what else could be causing this retardation?

Many thanks for any suggestions - am at a bit of a dead end.
countd
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