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i cannot comment on how faster it is then latest LR, i stopped using it at v3.something, but on my PC it is instant even with 80+Mpix files. With D800 i see no difference to D700 in speed of processing. Exporting was little slower (generating 200+MB Tiffs, 1100 and 200pix jpegs) but i moved my temp drive to SSD and it does it under one second per image now.
It was also 64bit and multi threaded before LR was.