I had an amd athlon tf-20 cpu which was a single core that ran at 1.6GHz, 2 Gig ram and an HD 3200. Unity runs slow as hell. I upgraded my cpu to an amd turion tl-56 dual-core which runs at 1.8GHz, and Unity still runs slow. My sister's laptop of 5 years with an intel celeron dual-core runs unity way faster than my laptop. Can anyone suggest the problem here and a solution?...please.
You need to have a decent graphic card and the corresponding drivers installed to run Unity.
If you don't have these then you can try Unity 2D (which will be a lot faster on a old graphic card), to install it on 11.04 :
Then you restart and when logging in select "Unity 2D" instead of "Ubuntu".