If you aren’t going to use the aTV as an actual TV display device, you can disable the “AppleTV” service and save 25% CPU instantly. The “AppleTV” service is not required to be running for the machine to function… it is only required to launch frappliances (XBMC, NitoTV, etc…) and provide the GUI interface, which is unnecessary for a webserver.
To do this, do ‘chmod -x /Applications/AppleTV.app/AppleTV’ followed by a ‘killall AppleTV’
You should be good to go!
I used this command chmod -x /Applications/AppleTV.app/AppleTV but like to get back as normal Apple TV menu.