Please help

This game is by far amazing, incredable graphics, engaging storyline. But I find that my computer is unable to run it even on the lowest of graphics settings. Its incredably laggy and can’t enjoy the game at all, I use a pretty powerful 2009 MacBook Pro with a 2.8 GHz intel core 2 Due processor, 8 gb memore, Nvidia GeForce 9400M 256 MB Graphics card, and run the latest software on it. Is anybody else having the same problem?

Precursor_Enigma about Borderlands 2, v1.6.0