While at first start the game will show the expected performance smooth, it can suddenly drop to a very low frame rate and basically be unplayable. Usually when systems fall to low frame rate, it suggests that they are overworked and for any reason have difficulty making the necessary calculations for smooth gameplay, and as a result will usually be relatively warm the graphics card is imposed, but in these systems is not the case and test some users have noticed that various monitoring tools show that the system to a relatively inactive, suggesting that the system is not imposed lot and is simply not necessary to perform the calculations by hand.
Apple 15-inch MacBook Pro Retina systems come with two graphics cards (a discrete Nvidia Geforce GT 650M for graphics-intensive operations and onboard Intel HD 4000 GPU for standard everyday tasks) that dynamically between active for savings optimal energy and gain autonomy. However, it seems that the problem is the way the system handles the switching behavior where he switch back to using more power Intel graphics and therefore not be able to handle requests fantasy games.
This seems to be a hardware problem based, as is the case not only in OS X, but also for games running under Windows under Boot Camp. It may have been introduced with the update firmware EFI later released earlier for these systems, but fortunately for those she encounters the problem seems to come from a defect in the hardware-based system settings, and can usually be treated by the system reboots the system controller.
Apple describes how to reset the SMC for these systems in a Knowledge Base article, which for MacBook systems retina following steps:
Shut down the computer.
Connect the MagSafe power adapter to a power source, connecting it to the Mac if it is not already connected.
On the keypad, press (left) Shift-Control-Option keys and the power button at the same time.
Release all the keys and the power button at the same time.
Press the power button to turn on the computer.
After these steps have been completed, the system should work as expected with graphics-intensive applications.
