This is sort of a cross-post with Computers/Programming, but the author of this forum software Rafał Pitoń, was recently interviewed on the podcast Python.init: www.pythonpodcast.com/misago-discussion-forum-episode-231/
It was really interesting hearing him talk about some of the performance optimizations he made, and also the (decade long!) history of developing Misago. It's a bit on the technical side, but still has a good amount of non-technical discussion.