rlparker's suggestion is a valid one, but if you connection to DH is normally fast and you're only having problems with SSH it's most likely due to a large number of E-mails in the inbox associated with the user you're logging in as.
After you log in and after every command you give is executed, a service checks your inbox to see if there's any new messages.
To see if this is the problem you can either clear out your inbox, or a better solution is to log into SSH and edit your .bash_profile
and insert this line after the text in that file
Press ctrl-o to save the file, and ctrl-x to exit. Now log out, and log back in - and with luck your problem is fixed.
Hope this helps.
art.googlies.net - personal website