Hey, I may have a little tip for you. I assume you have SSH access to your server, try these steps. There are really simple ( I did it to mine and freed up 50% RAM) It's something to do with Apache and benefits your server load by huge amounts.
Try it out.
I am not 100% sure if this was the tut (as I googled it) but it looks like it:
http://www.agnivo.com/tech/vps-mysql...-guide-27.html