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I'm using Ubuntu 12.04 unity (the problem was there before i upgrade) with an Intel® Pentium(R) 4 CPU 2.66GHz and my problem is that the CPU usage gets to 100% whenever i open an application and sometimes it crashes this is a snapshot of the system monitor :

if there is a way to lower it i ll be thankful if you tell me

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Did you have the same issue with Ubuntu 11.10? As I believe that it is simply because your CPU is a slightly older one, I have the 2.8GHz model and the usage on that is relatively high with most operating systems. – Ross Fleming Apr 3 '12 at 17:03
up vote 1 down vote accepted

You could try unity 2d a go to see if that helps.

Log out of your current user and click on the Ubuntu logo next to your name on the login screen, next choose Unity 2d and then type your password and log in.

If this does not solve your issue you could try installing "Gnome" from the Ubuntu software Center and log into "Gnome Classic" using the same method as above (Although selecting Gnome Classic instead of Unity 2d)

Hope this helps.

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