blender with mac book

i have been using blender on my macbook and it seems kind of slow. sometimes its fine and sometimes it gets really slow. anybody know if getting a certain version of python will help? i tried installing 2.5.2 instead of 3.01 but i cant tell the difference. its a ehite macbook with 2.0 intel core 2 duo and 2 gig ram.

and here are some other noob questions i have.
is there a cetain format and size of a pic than can be put on the cube during the uv tutorial because the pic i choose never shows up?
what tutorial will show me how to unwrap an object into a flat piece that can be imported into a drawing program then re wrapped on the object?
is there a way to rotate the view with out middle mouse button so i can do it on the macbook without an external mouse?