With time my notebook at home got slower and slower. I blamed Ubuntu. But today I actually checked what is started by default, and I had mysql, postgres and mongodb servers running, and a bunch of other stuff which I never use, but Installed it some time in the past. I removed as much as I could and went from an idle load of around 1 to 0.1 which is pretty nice. And now my notebook doesn't feel slow anymore, even with Ubuntu.