The most frequent question I get is "can the forum handle X number of messages and X number of users" or "can this forum handle as much traffic as a phpBB forum?" Unfortunately, I don't know the answer to this question because my use of the chc_forum isn't very high-traffic. I can say that between version 1.0 and 1.1 I rewrote major parts of the extension in order to make it run more quickly because there were some bottlenecks in early versions. If anyone is using the forum on a high-traffic site with lots of posts, please email me and let me know how it's going. I'd like to be able to point potential users to examples of the forum in action.