I'm running Ubuntu 12.04 on my Dell D830 laptop. The laptop has 2gb RAM 1.8 ghz CPU and nvidia quadro nvs 140m. I feel that 12.04 is a bit slow and gets even slower after three or more programs is running. I have noticed that Win XP had better performance with Blender than Ubuntu 12.04. Although I was using 2.59 blender in xp and the latest version of blender in ubuntu. But can these two versions have such a big difference that the latest Blender is much more heavier.

Is it normal to have not smooth performance of 12.04 with my laptop? Will the experience improve significally if I upgrade my RAM to 4 gb or even 8 gb? What is the max RAM amount in 12.04 32bit anyway?