One thing that the BBB does is personalize itself for each user. For example, I am only able to edit my own posts, and it keeps track of the messages I've read. I know it does this itself because there is continuity between the computer I have at work and the one I have at home, so there's a fair amount of processor activity involved in keeping the large number of messages tallied for each user.
I note that every time I change pages, it appears as though it goes to a blank page, then to the page I click on. It's a nifty feature, but it takes a little processor time, no matter how fast your connection.
And when it comes to navigation, I find it far superior to Yahoo's message boards. Since they forced the Beta version on everyone, conversations are impossible. I've griped to them, but since most of their boards are simply legal graffitti, they have little reason to care.
--I know what I like--