You can use this application to disable some of your computer's unused cores when it's loading slowly. That way, you'll reduce energy consumption and heat dissipation. By default, Windows does not provide a direct way to adjust these parameters, which is what makes this application so interesting.
Park Control is a tool that won't come in handy for everyone - nor will everyone know how to use. In fact, before using it, a popup window advises you to make a 'backup' of your energy configurations, just in case. Still, it can be very useful in certain cases.