Rhino File Size

When I open and save a 1mg SketchUp file in Rhino, it becomes a 10mg file. Can anyone explain to me what that’s about? And if there’s anything I can do about it?

Thanks in advance.

Hi Arial- most lilkely it has to do with Skp’s method of using what in Rhino are blocks- very inefficient from Rhino’s perspective. Also, are you importing as meshes or trimmed NURBS faces?