simonb, HaroldL &DavidJ I am not an expert in this area but I can understand that there are two kinds of 3d CAD softwares: 1.- The one specialized in giving mathematically very precise shapes; 2.- The one specialized in giving a precise graphic for video games that is not necessarily precise. Each of the two types of programs has a specific hardware requirement. The dilemma is that AD is a program for engineering use, that is to say its objective is to give a mathematically precise form. I don't know if you read my link a few days ago about two big brothers, where this problem is described in detail. As I understand it, the only thing AD should do is to keep its character of engineering program, that is to achieve mathematically accurate shapes with the lowest possible weight of kb, improving its features such as the possibilities of shape sculpting and loft while keeping up to date with Direct X or Open GL. Nothing more. I would like someone to comment on this to see if I am right.