[Plugin: Quick Cache ( Speed Without Compromise )] quick cache not caching pages correctly

This plugin is speeding up the loading of my site tremendously, however, it seems that there’s still a lot of php instances sql queries going on despite the caching. The site gets displayed way faster, but there’s still a huge load on the server. I’ve got a number of loops going on throughout the site, and I’m wondering if maybe those queries are failing to get cached somehow even though maybe the main loop is getting cached. Is there anything I need to do differently with secondary loops to make sure they get cached?

http://ww.wp.xz.cn/extend/plugins/quick-cache/