I think OS X is not extracting maximum performance out of the rMBP hardware. In bootcamp, the machine can use more power than the power adapter can provide. This seems to never happen in OS X. So to me it seems Apple has engineered OS X to run the rMBP in some kind of energy saving profile which prevents the machine from not using more than 85W, while the hardware is capable of doing more. We are basically paying for hardware which we cannot use to it's maximum. Apple should use larger power adapters (it's a 2000+ laptop) and let OS X use more power under heavy load.