I don't know what you did, but the various forums take two or three times as long to load for me now.
Not infrequently, they just go into and endless loop that can only be stopped by closing the tab.
Just as a double check, i cleared all history/cookies/etc and defragged. BF is the only site I notice it on.
Again, just a FYI, but whatever you changed was not for the better on my end.