This administration component presents the PHP Express cache control page as component so this functionality accessible in a standard way for Joomla administrators and is not in a page which may be accessible publicly.

PHP Express is a PHP accelerator able to pre-compile and cache PHP pages to improve performance. It's worked well for us where we do a lot of server-side processing as part of generating a reponse page.

You can find out more about NuSphere and more about PHP Express in the PHP Express manual on-line.