Except the problem is that with that, and app nap, programs like Final Cut Pro end up going to hell, as they usually do background rendering, and need the CPU and GPU for heavy transcoding, rendering, and exporting.
Everytime I saw a beach ball, I'd have a black part in my video that lasts exactly as long as the beach ball did. Which means 10.9 is horrible for people that need machine that actually uses all its resources.
I've even had several parts of music or effects come out garbled and just static because of those.
They either need to fix things, or get 10.9 to recognise when a machine isn't running off a battery, especially for iMac, and Mac Pros, so people can get the most out of their machine.
Not only that, but there shouldn't be system pauses/freezes at all. The fact that there are, means this new methods are still not ready for release.