I have a Macbook air 2011 and the Macbook 2008 unibody one. When I play Minecraft on both machines, the 2008, 9400M, 2.3GHz C2C one runs at 50 fps but the 2011 13" runs at 25-30. They're both running the same version of Minecraft and Java, and both have the same amount of RAM allocated to minecraft. Anyone got any ideas why this is happening??