This time it is from the FCP god, Larry Jordan
(the a/v quality ain't too good, but the info is)
In one thing he is, in my experience, right: The optimization and analyzing is, mostly, a waste of time. If you have to have to analyze anything, you can do it during editing. The "people" finder works somehow, sometimes, but I would only rely on it if I hadn't shot the footage myself, or it was too long ago to remember.