I routinely have huge tiff files in my AutoCAD drawings. I work for engineering company that does subdivision and showing the bit maps behind layouts is very importune to us. the tiff images are 3' pixels and usually 5000x5000 pixels and usually 75 megs a piece. Now what I want to know your opinion on which hardware is important on computer to push these cad drawings around. how to I make it go fast? more memory? faster harddrive? does and expensive video card help? thanks. a friendly lurker