First Byte issues

[tupper]

http://www.webpagetest.org/result/150525_KD_Y3W/

Hi,
I've inherited a IIS 7.5 server running PHP 5.3.8 and MySQL. The first byte is always high, usually between 5-9s, even with a static page. I've been looking everywhere, but can't find anything. I'm more experienced with linux and apache, this microsoft environment is slowing me down. Any help would be welcome thanks.

I've search through many threads but so many are unique, I've tried some of the suggestions.

Thanks