trying to understand. OK my website is growing fast and trying to stay ahead by planing what to do next when one server not enough. i been planing to get 2 server just to run my site and already using litespeed load of the server so far still good after have my server tech optimize sql and a few things more. average load is 3 and thats with 750 members online . actual server is a quad core 2.4 with 4gb ram using litespeed 4 cores. and we use vbulletin . my site is expected in few months to have a average of 5000 members online at same time(some days).Because of this i been research on what should be next step. how Load Balancer works ? do you need 2 or 3 server for that ? what the best setting to have ? can all this be accomplish with one server?