Hi Michael - I've not had the chance to torture Mavericks with MoI yet, my hypoxic princess is going through a bad phase at the moment and sadly this has prevented me from doing any serious modelling for weeks, however Mavericks feels quicker, as if they have done some 32bit handling improvements in the 64bit OS, this could be down to the fact that I did a clean install rather than an upgrade so there is very little clutter at the moment ....

Beta3 is also performing well with simple quick and dirty models with blends and booleans. If she gives me a few hours break then maybe i can try a more complex project to stress test it a little

All the best

Martin