I installed ubuntu 13.04 with unity, but it occupied so much CPU and the temperature is a little high. Then I use the command 'sudo apt-get install xfce' to install XFCE. But it seems no improvement and here is the details:
Memory:4419MiB(11.8%) of 3.7 GiB
My CPU is:inter coreTM i5-2520M CPU @2.5GHz.
Could you tell me why and how to deal with it? Is it related to the NVIDIA deriver for graphics is not installed?