I do know that some files take longer to save than others. It all depends on how big the file is. A good example would be that BobCAD takes a while to save most of the Solid Models that I make with it. Masterecam not only saves the drawing or model but it also saves the NCI file. Depending on how big your CNC file is can also slow things down.
Shared Graphics RAM is a No No with CAD/CAM. The extra RAM Memory you have helps only a little.
If you go to your Task Manager there will be at least 12 to 16 programs running that are linked to Norton Systems. That is way too much.
A Dell Precision WorkStation is what you really need to run MC.
http://www.dell.com/content/products...=04&l=en&s=bsd