@kupu that's old school 90's style I know it was made in 2008 but damn you deserve better. Keep the Mac for 'colouring in' this game and a light Dowze for gaming, you'll do better. I don't know if you do game that much, but whatever. If SM becomes big (or rather 'when') you'll obviously want better.
I figure it might just be compatibility or drivers, this game is more CPU heavy than graphics. Update the lot, give it a kick say a few Hail Marie's and see what happens.
To everyone else: With games you never pick a laptop, you can never upgrade the GPU without tears pain and a damn ton of dosh and cleaning it out also requires monthly sacrifices to Lord Satan.