From what I basically tell (and someone can correct me if I am wrong), but it won't really be the number of users per say, but basically from all the stuff you have on your site how much memory/cpu is going to be used at any given time by your site. I noticed your site has a lot of subforums and what looks like a decent chunk of mods. So really it depends on how much load those mods put on your site, but if you are having problems right now it may be an errant script or a mod that needs updated more than the number of users you have on your site.
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