The lack of performence report about some big site based on django or djangobb is a problem. So please make a test, like maybe 10 thousands topics to show the result or compare to some other apps based on PHP maybe.

mark, a comparison of various programming languages, you can find on the site http://en.wikipedia.org/wiki/Comparison_of_web_application_frameworks

And if you would like to compare the speed of the forum DjangoBB with some other forums, then maybe we'll do that later, but so far we do not have a stable version DjangoBB. We're working on it