@unknownuser said:
I use SimLab Composer. I have tried the rest, Alibre, ViaCad, 123D beta and others programs, and Simlab does the best conversions. But to be honest, nothing is going to turn a high poly model into something that Sketchup is not going to choke on.
This would be an incorrect comment due to lack of knowledge and experience, which is common on SketchUp forums since 2010. As I and the original SketchUp developer worked together to write the main CAD -> SketchUp conversion system in 2005 before he sold off the company, I'll point you to the proper methods to get any sized CAD file into SketchUp with good efficiency: