I'm running Ubuntu 13.04 right now, with KDE 4.10.4. Most people generally regard it as pretty bloated, but I'm sitting at 1-2% CPU at idle with about 500mb memory used including caches.
Wow cool...but ubuntu is gettin bigger eating more stuff...u have to agree with that......the old ones were way less user friendly but did not eat CPU,ram,hard drives
Ubuntu on a laptop was too much of a CPU hog, which is why I use Crunchbang now. Ubuntu, at idle on my laptop was about 20-30%, Crunchbang is 1-2% idle.
Kernel, drivers, daemons, services, desktop managers, applications, GUI clickety clap crap. Pay attention to what actually consumes cycles. GNU/Linux distributions offer varying collections of stuff, but you don't need to limit yourself to the default. I've gotten the impression that there are myriad of different Ubuntu variations out there.
@fred he is just trolling with u....but I have ubuntu and windows dual booted...my big bro plays alot....I sometimes play cod mw3 it's the best game in my opinion