I have a 2012 MacBook Pro (16GB RAM, SSD) with an integrated intel HD4000 + dedicated GT650M 512MB GDDR GPUs.
I have noticed that the game (even with 1.1 patch) runs faster on the integrated GPU! It's almost unplayable on the GeForce, but runs quite fine on the intel GPU (even on high settings).
Is this issue related to the limited amount of dedicated GPU memory on th GT650M?
Also I tried the game in OS X and through Bootcamp - way better performance on Windows