Preemptive multitasking, multiprocessing simmetrico, l'allocazione di RAM dinamica, multithreading, supporto per 32 e 64 bit ha Mac OS X per lavorare in modo più rapido e anche più affidabile. ###>Preemptive multitasking, Symmetric multiprocessing, Dynamic RAM allocation, Multithreading, support for 32 and 64 bit has made Mac OS X to work more quickly and also more reliable.