Mate has always been that way in my experience. I was watching a fresh Mint 17 install and the idle CPU was running from 0% to 40% (on an AMD A6) with nothing running but the DE. A year or so ago I was testing the PCLinuxOS Mate and it would spike to 100% all the time. I have just given up on Mate...
Last edited by NGIB; 06-20-2014 at 09:38 AM.