Need your help guys
I'd upgrade my computer instead of downgrading my images! As soon as I got my D800 I encountered the same problem: Aperture was very slow processing the 75 MB RAW files! I expected I'd need to buy a new laptop. Instead I tried a solution that worked well and cost me about $50 instead of $3K! I simply bumped my RAM from 4GB to 8GB and my speed improved dramatically in Aperture.
I'd still like a new MacBook Pro with Retina Display, but I solved my problem and saved lots of $$$!
There is only you and your camera. The limitations in your photography are in yourself, for what we see is what we are.