First sorry i do not know if something has been done about the CPU usage part, i just want to know if there is something wrong with my part.
And when i try to create a new folder or script the whole app goes white and crashes
This is not a known issue - please report a bug when this happens and post the case number here.
Removed and re-installed Unity 3 hours ago (sorry for the slow reply) and the crash problem went a way