I am using a theme for Genesis called Outreach. I was having a terrible time with site latency. It seemed like it was something in the theme, but I couldn't pin it down. Rackspace ensured me it was not DNS resources, so I installed W3 Total Cache, which I have used with successfully on other sites. I spent several hours tweaking Total Cache and double checking php files with no luck at all. I read about WP Super Cache on a forum and had the latency issues solved within a few minutes of installing the plug-in. Thank you so much!