Seems to hover at 25-30% CPU when viewing the face, and very little when face is hidden.
The CPU usage is now directly proportional to the number of screen refreshes per second. Increase the time between screen refreshes and the CPU usage will decrease linearly. From the readme file:

To control the number of CPU cycles that the program
consumes, adjust the time between screen refreshes in
the configuration screen. This also controls how much
network bandwidth is used. The less time between screen
refreshes, the more CPU cycles will be consumed.

The program should only consume CPU cycles when it is
actively grabbing screen images from the player and
displaying them. To consume as few CPU cycles as possible,
minimize it to the system tray, or show only the remote
and leave the face hidden.

Found a little bug for when I checked hide face, it showed the remote. So I checked hide remote and it showed the face.
 By design. From the readme file:

- You can't turn off both the remote and the face. If you
turn them both off, then one of them will reappear. If
you want to make them both hidden, minimize it to the
system tray.
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Tony Fabris