I have a new macbook (not pro)4gb of 1.067ghz RAM, 2.26 intel core 2 Duo. 22 gb available on internal HD. I am editing an SD project (FCP 7) and this thing is going painfully slow. Litterly I'm advancing frame by frame using the arrow key and i am getting a 10-20 second spinny wheel to do even that! I can't scrub sometimes because I have to hold down the mouse button while I wait for the spinny wheel, then wait again at each movement. This thing is brand new, like April 2010, it should not be having this much trouble with an SD project. I tried trashing preferences, is there anything else i can try? I am editing off of internal HD; its either that or USB because there is no FW on this computer.