Looks like this uses anywhere from 4-20% CPU while running on my 3.4 GHz quad-core i7 iMac. Have you thought about laptop battery life/power bill/world pollution implications?
Great question. As you correctly noticed, we use about 3-30% CPU and 30% only when gesture occurs, so on average it uses about 5% CPU - less than your average browser. Hence, our implications should not be any diff. Thanks for point it out, we will certainly keep an eye on it.