My peiced together Custom CentOS 6.5 x64 build doesn't use a cache plugin at all.. It's much faster than these solutions.. I documented the software used.. It's a nice OS Configuration for any vps account.. And it's also server wide meaning it speeds up forums or anything else on your site if Wordpress is in your root directory. http://boi-infinity.com/wordpress-optimization-2014-behind-boi-infintity/