I haven't tried using a Retina MBP - but on my MacBook Pro (15-inch, Late 2011, Model 8,2, OS X 10.8, 2.5GHz Intel Core i7, 8GB RAM, AMD Radeon HD 6770M 1024MB, Apple SSD TS256C), I can get about 6-12fps. The NVIDIA GeForce GT 650M in your laptop obviously gets you SLIGHTLY better performance.
See:
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