Slow how? What kind of internet connection do you have? For most home broadband connections, the upload speed (the speed at which you serve web pages) is a lot slower than the download speed (the speed at which you can view web pages on your computer)...
My internet connection is 1024K/128K but I am saying that it's slow on my computer. That meen I run Apache, PHP and mySQL on my machine locally, as a server.
When I surf the site on the live real server it's normal fast.
Check your PHP code. I think the default Mac OS X PHP installation has a bug resulting in relative includes take forever to load. You could try to replace them, if any, with definite paths.