In my (rather limited) experience, running a site with joomla smf and cb will inherently entail a fair amount of elbow grease on the part of the administration.
I have recently removed CB from my primary site, mainly due to resynchronization problems. I have a couple dummy sites still running, but the errors keep on popping up, even under a low stress load.
I love the idea of community builder, and I will continue to persist in trying to make it work... but i cannot sanely advise anyone looking for a stable solution to use this system at this time.
Sorry.