FYI: Your RAM usage is not 150MB, that's only for the main process. Each tab is it's own process and has it's own RAM utilization as well as CPU utilization.
Bumping my memory up to 8GB ($130 from crucial) helped a lot though. No more paging issues for now even when running photoshop, firefox, safari, chrome, zend studio/rubymine/eclipse (yes, I use vim too, but it uses practically no memory)