Increasing RAM on my existing machine did improve thing at lot but NX shows a preview of an image in macro blocks and CPU has to process quickly or redraw is noticeable and slow. RAM caches these macro blocks so any part of an image has been viewed before will display faster. I have a 4Mpx D2Hs and my existing machine is more than capable processing and displaying its RAW's if only I could find the same level of performance to view and display 12Mpx D2X images.
Going to look at NX on a 2.66GHz 1GB RAM Mac pro soon as I have found a retailer in Nottingham and will advise performance.
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