We've currently moved our website to a Windows Server 2008 R2 machine. It's running IIS7 and on that PHP5.4
Everything seems to work properly, but there's a strange behaviour I can't seem to fix. When I load a site, and look at the way it's loaded (The 'Net' tab in Firebug or something), the timeline shows me that everything is loaded very quick, but when the 'main page' (the initial GET request) is loaded, it seems like the server is just 'waiting/idle' for 2 seconds.
http://imageshack.us/f/819/ne5n.jpg/
Does anyone knows what happens?