I like the #XFCE desktop on #Linux and #FreeBSD as it is full featured, bug free, and lightning fast. I noticed the battery life on my new laptop was ok, but found it odd why the CPU was running at high frequencies at all up to 5GHz. So I set the maximum CPU speed at 500MHz, which is faster than the insane speed of a #DEC #Alphaserver in the early 1990's. And this is still that fast, but with 8 cores. And now the battery is on the second day at 86%. Even when compiling code, 500MHz is insanely fast. The battery charge might last longer than some calculators I had...

"500MHz ought to be enough for anyone"