Adobe Illustrator AI file has been saved as a DXF or DWG

The file will contain B Splines if saved via Illustrator via Export - DWG/DXF

It is necessary to convert all b-splines to curves via the Menu Curve - Manage - Rebuild - ARCS & LINES in TopSolid to ensure the model is not slowed down by the B splines and can output to CNC