Originally Posted By: tfabris
iTunes is a big one because it installs Bonjour, which on Windows, has been successful in slowing down certain operations (such as inserting a 30 second pause in every shut down or sleep/hibernate the PC does).

I still have never seen this behavior. And this is coming from having Bonjour on every Windows (XP/7) machine at a former company, including the servers (2003/2008). I wonder what is causing it for you.