You need to simplify it to eliminate all the different elements. On the face of it, there's nothing there that should take 10 seconds to return. I'd start by just paring it down to a script which just returned a valid http response. If that's okay, start printing out your css references, then the full formatted page, then load the file. etc...

Good luck :)

Update:

One could argue that you should have done this in the first place. On more than one occasion I've been typing up a question intended for SOPW, trying to create a simple example of what's going wrong. The example ends up being so simple that I solve it myself.

Perlmonks becomes a surrogate for that colleague who you explain stuff to, just so you can figure it out for yourself.