Help please, I don understand some part of this plugin

Hi anyone!
I been using this now and then to track broken images calls, that slows down the site. Now I would like to use it as it propably is created for.

However, I would like to scan a single page from the FRONT END, or all pages on the front end, to see the plugin impacts on page load for visitors. Not any visits in the backend.

I always get everything scanned in return, inluding dashboard and some admin pages, and got plugins that only are loading on certain admin pages, and so on.

I read most topics here, documentation and experimented with this on clean installs and old fat ladies with many plugins. And I just don understand how it scans.

Some one help me with a hint here?

Thanks!

http://wordpress.org/extend/plugins/p3-profiler/