vB
is innefficient when compared to threads, a quick glance at their own support forums and their hardware recommendations can tell you that - even a moderately busy forum will require one dedicated server. For a site that has 500+ concurrent users, I have seen them recommend 3 servers - one for the database, one for the forum files, and one for the rest of the site's html. I know of one such site personally. This is not criticism, it's facts.
If you wanna see something funny, ask one of those sites to run vB and php 4.2 with register_globals turned "off" - heheh....
vB is decent software, but they've got some serious issues
