I have done mine with the original size "STL file on Mastercam X4 but it had hard time with such a big file.
For my drawing and programming, I have a pretty good computer, Dual quad core at 3.5 Ghz with 4g of ram and a quadro FX4500 video card.
This computer is dedicated for that purpose only, no other software, no internet.
Mastercam X4 support multi core computer and for the Tiger Head, like I said had some hard time computing the tool path.
My video card was somewhat borderline for this file.
Happy to see that the one I posted with reduced triangles work for you, has been modified with Magic 11.1, nice software.
Jeff