This panel plugin offers multiple display modes (LED, gradient, fire, etc…) to show the current CPU load of the system. Various appearance options, like colors or size, are customizable.
On multi core or multi CPU systems, CPU Graph can either track and display all of them at once, or at the user's option only a specific core or CPU.
Bugs should be reported to the Xfce bug tracking system.
The normal (and best) way to get the CPU Graph plugin is to use the package manager or port system of your operating system.
If CPU Graph isn't available there, or if you want a different version, you can download it in source form from http://archive.xfce.org/src/panel-plugins/xfce4-cpugraph-plugin/.