I came across this plugin a few weeks back, and decided it might be worth using for a future project. I've just installed it on WP 2.33, and I think it all looks fantastic, especially how well integrated it is with WP.
I happened to have the $wpdb->num_queries; output displaying in the footer, and with just one admin user, and no 2 empty forums created, it was chucking out 85 queries. Are there any plans to make it less resource intensive, or anything I can do to cut the database usage a little? I'm wary about using something that calls the database so many times per page load (reminds me of Pligg in its early days).
On a similar topic, is Simple Forums compatible with wp-super-cache? I realise that it may not be so appropriate for forums, but wondered whether it would cache forum pages, and if so, whether the cache is flushed upon new threads / posts being added.
PS. I also noted that the plugin adds about 15 queries to all my other blog pages, even though they are seemingly not connected to the forum side of things?