vincevincevince - 5:53 am on Oct 17, 2009 (gmt 0)

To some extent you must consider the bandwidth use; is the forum full of media files etc. or is it mostly text like WebmasterWorld?

The traffic count does not sound excessive; however the real measure is response time. Do some benchmarking against other major forums and figure out whether you are slower than, similar to or faster than them.