Hi nameless, those are looking good!

re:
> The program seems responsive even when calculating impossible operations.

Yes, commands that can potentially take a long time to calculate like booleans or fillets do their heavy number crunching calculations in a separate process called moi_commandprocessor.exe . That helps to keep the main program UI responsive during those things rather than just freezing up.

The other thing that's very helpful for complex operations in v4 is that now since it's a 64-bit program it can make use of all your system RAM and won't hit a wall at 3GB or so like version 3 would.

I'm glad it is working well for you!

- Michael