Do you use something called optimizely.com? When browsing Chowhound, the Back command in my browser hangs indefinitely with a status message "Waiting for log3.optimizely.com."
i posted a complaint about it a while back. it's not you, it's the site. i worked around it for a while by installing a NoScript add-on, but it was too much of a hassle because it was blocking too many scripts on other sites that i actually wanted to run.
engineering said they were working on it back then, and it did eventually resolve for me...for the most part. i still occasionally see the script when a page gets hung up here on CH.
what OS & browser are you running?
I get slow loading while seeing the same message for optimizely.com, but not a hang; it loads eventually.