When importing artwork from Illustrator or Autocad, the resulting spline is horrible to work with owing to the number of vertices. None of the import options fix this problem. Personally i use a commercial script to improve the spline, but this doesnt make sense. Autocad & 3dsmax come from the same company - so they should be able to get this connection working better. A simple shape requiring no more than 20 vertices can import with 300,000 vertices. The import process needs to recognise the arcs/curves and translate them into beziers or whatever else makes for a more efficient translation of a non-linear piece of linework.