Moving from one server to two?

[BrandiDup]

I'm wondering if you can tell me about your experience with moving from one dedicated server to two. How big was your site when you made the move (how many concurrent users, how many total posts, etc)? What prompted you to move, were you encountering database or server issues (Slowness, timing out, etc)?

How do you have your site setup now that you have two servers instead of one?

I've basically been told by Liquidweb, as well as a someone else who specializes more in vbulletin and server optimization that I really should consider getting a second server. We've been having issues with slow load times and "server time out" errors, despite having our current server optimized as much as possible.

How do you suggest splitting up the site between two servers, to relieve the pressure on one server? We don't have a lot of images so I don't think we would need one server just for image/attachments, we just have very active posters who love to do searches and keep things very busy.

Just looking for a little advice since this is all very new to me.