marcof said:
if so I believe that the file from 570.000 3d objects is pure metropolitan legend, unless it is 570.000 polygons.
Shouldn't I just answer you for this statement, would the sense of inventing all this topic be to create a legend?

In fact, you should not answer, especially when you do not read everything you answer or at least bring a partial and misleading quoting.
I had written what I bring you back under:
therefore autocad in 3d works on polygonal solids for which in a plant with piping a single elbow curve consists of, I know, 200 polygons to render in realtime? This is how I believe that the file from 570.000 objects 3d is pure metropolitan legend, unless it is 570.000 polygons.
that if you allow it assumes a meaning well different from what you wanted to read: it is a consideration to a question that I placed myself, that is if autocad works on solid polygonal to render realtime, question to which he answered "enri". said this, it seems that if even autocad does not generate polygonal solids its shade display engine is an immonda key.
I am going to ask you the fundamental question you have not answered yet.
the file from 540.000 items you have available was created with autocad?if yes, on which car? Here, those who created that file have a machine that can handle it so ask them what video card they use.
my suspicion however is that that file is not native to autocad, but is the result of a dwg export made by a program dedicated to piping and industrial planting, which obviously works with a realtime rendering engine for the manipulation of the models that really works, not like that of autocad.
from how much you read here your 3600-part model, open with autocad, is practically at the limit of usability. how can you even think about opening one that is 150 (cen-to-cin-quan-ta) times larger? then talk about working on it? Well, that's what I was talking about. imho want you to use a file on autocad that was not done with autocad
I hope for you to make a big mistake, but probably with autocad you will never be able to work on that file