there isn't a way to stop the program from auto calculating every time you make a change.  Are you saying that you make a change, and the program just sits there and spins for hours, and you are unable to do anything during that time?

If so this is very concerning.  It is possible that it is due to the fact that most of these calculations are not yet ready, and the program is struggling to work through them, but I would like to look more into it.