[UPDATE] 06-28-07 12:44 PM After recompiling the webserver (Apache) and a few of the other tools used by it performance has been returned to normal.
[UPDATE] 06-27-07 04:05 PM This problem is more complex than we originally thought, but we are still hard at work on the problem and do understand your pain with this issue.
We are seeing slow performance with webmail on the server Squid 15. If your account is on this server webmail may load very slowly or possibly timeout. We are currently looking into the matter to resolve it.