Sounds suspiciously like a DNS lookup. We actually make two network connections (one for the RPC channel and then one for streaming user output) so that would explain your delays.
What platform are you running on?
Red Hat 7.3 Linux on an Intel box and CMUCL 2004-06-29 snapshot. I cvs updated Slime on 2004-06-29. I first noticed this long delay in January this year.
Off hand the only thing I can think of that could explain this is if you're on a GNU box and your /etc/nsswitch.conf says to check 'dns' before 'files' (i.e. goes to the network before checking /etc/hosts).
I have the following in /etc/nsswitch.conf:
hosts: files nisplus dns
Thanks.
-cph