[ Thanks to Dmitri
Popov for this link. ]
“Switching to a lightweight graphical desktop environment is a
great way to improve the overall performance of your system,
especially if this system happens to be a notebook or netbook. But
if you opt, for example, for LXDE, you’ll discover that it lacks a
graphical tool for managing power profiles and controlling the
processor frequency. This might not be a big problem on a desktop
machine, but the ability to adjust power settings is crucial for
improving the battery life of your mobile companion.”