Topic: Server slow only on port 80

No other port is slow, but port 80 takes 15 seconds between the time the browser initiates contact and the server responds. I just installed cloudmark for spamassassin, but I'm not entirely certain that is the problem. Has anyone come across this problem before or have some clues as to what it might be?

You're in a bad habit of not supplying enough information.
Both cloudmark and spamassasin are involved with your mail, not your webserver.

What webserver are you using? What OS is this? What happens when you telnet to the port and say
"GET /
" (including that enter) - does it delay before or after your command?
...