I primarily use adobe's creative suite software on my mac. I have noticed it goes so slowly doing things in photoshop. In premiere pro it just crashes. Even when no CS4 programs are open, there is still high memory usage. Have a look at the attached image, less than 1GB available of 4GB when I am not using maybe a gig max with my programs. It's a macbook pro 2.4 GHz I5 4GB ram. Why is it using so much memory and how can I cut it down?