phploadavg is a PHP script that is used for displaying web-site load (and performance) in a graphical way in real-time.

The new version of phploadavg 2.0 can be used now without requiring a PostgreSQL database--in fact, it doesn't require any database anymore. Installation is a snap: FTP the script to a folder on your PHP enabled web-server and you know the load (and performance) of your server for the last couple of hours or more.

For additional information, visit the PHPLoadavg website:
http://phploadavg.sourceforge.net/