Nikon D600 Noise Reduction Off ?
They have no effect on the resulting RAW file but they do take some time to process so you should just leave them off if you are shooting only RAW. You might leave them on if you sometimes shoot JPG so that you don't have to change all of those settings when you switch back to JPG.
|AF4_2483 Surfing the Serengeti by DaveInHouston|
from Hot Air Balloon view
|Peregrine Falcon by Psychic1|
from Best Wildlife Photo of the Week - 4