Here is a really good tip. Since the Raspberry Pi2 only got 1GB memory I thought why not try compression. After installing zRam on my Ubuntu MATE setup I can only say WOW. That is some difference. The Iowait is gone. No waiting even with lots of tabs in the browser and multiple programs running at the same time. Everything feels snappy and the Pi2 gets to be even more awesum.
Info taken from http://askubuntu.com/questions/174579/how-do-i-use-zram
installing in the terminal :
sudo apt-get install zram-config