It was a hardware issue and it is now fixed. You can read more about it here http://askubuntu.com/questions/122055/poor-system-performance-on-my-machine-running-ubuntu-12-04beta-2-updated-to-the
It was a hardware issue and it is now fixed. You can read more about it here http:// askubuntu. com/questions/ 122055/ poor-system- performance- on-my-machine- running- ubuntu- 12-04beta- 2-updated- to-the