Hi Lewis - I think Divide larger than of 2 is probably too small for your 100x scaled object, try like 20 or 10. Just at 5 it's generating 4 million polygons.

The strange behavior is probably from having memory get swapped out to disk, everything will grind to a halt and perform very poorly once that starts going.

It is possible to limit the amount of memory that MoI will use on Windows, there's a setting in moi.ini under:

[Settings]
MaxProcessMemoryUseGB=

If you set that to say 1/2 of your system ram that should make MoI fail when it reaches that level instead of having things bog down so much.

- Michael