Find out who hogs (memory|CPU) on your system.
If you have npm installed, do:
git clone https://github.com/hellerve/hog
cd hog
npm install -g
Someone seems to have taken hog on npmjs before me.
Sorry!
hog [cpu|mem]
Searches for clutters. Per default, it searches for memory hogs (I'm looking at you, Firefox).
GPlv2 License. (c) 2015 Veit Heller