I have no complicated models like the motorcycle Frenchy Pilou shows in post 12 of this thread and I have never used MoI natively under Windows.
All I can say that I feel no difference in UI performance between using MoI in OS X and in VMWare.

One thing that takes "forever" though in VMWare and OS X are Sweep operations.
Does the following give a result under Windows?
A 0,5 mm diameter circle sweeped around a 1000 mm long helix with 5 mm diameter and 1000 turns calculates several minutes but gives no result in MoI VMWare and MoI OS X.

When I shorten the helix to 100 mm it takes about 50 seconds of calculation before the result is displayed.


Am I asking too much from Moi by sweeping a circle around 1000 turns?