You must decimate your model with free MeshLab by example ! http://meshlab.sourceforge.net/ (525 000 Faces --> 25 0000 faces 5 seconds)
before use the _ImportOBJ by Max Smirnov!

Here 15 seconds for import / resize result of 25 000 surfaces!
http://moiscript.weebly.com/uploads/3/9/3/8/3938813/25000_faces.zip (12 Megs)
(Waiting the max Polygon Converter for nice Nurbs surfaces :)