I have the same problem using Firefox at work.
www.ncix.com never fails to exhibit the problem. The main page loads fine, but click on any product and it takes forever to load, but it does load in the end.
Down in bottom left it sometimes says connecting to ws.sharethis.com, or google-analytics, but I think those are red herrings.
I'm kicking myself because months ago I observed that I could do...something...and make the problem go away. Damned if I can remember what that something was, though!