Log cached page load times

I need to log the page load times when serving cached pages. I am developing a site with multiple sections on static pages that can be edited by the end user. I am examining various ways to do this and the one I choose will be the fastest. I can easily view the memory usage and times using a memory viewer plugin for un-cached pages but I’m having trouble getting the database usage and load times for a cached page because any plugin or code I add to the page to log gets cached with the page and doesn’t reflect cached page load times.

I have enabled debug mode in the plugin but it only gives load results in seconds whereas I need milliseconds and database queries.

Thanks

http://wordpress.org/plugins/wp-super-cache/