Prototyper is far too SLOW too work with when the prototype exceeds 40MB. So slow, I spend about 3/4 of the time waiting and 1/4 actually working. My prototype is now 80 MB and I literally cannot continue since it is too slow now to keep on working with it, and its not the computer's processor nor its RAM since they're quite powerful, nor having other programs open. It could help to be able to have more than one prototype open at the same time in prototyper, so that I could copy/paste screens from the complete prototype to an empty one back and forth and work with the latter to avoid waiting for each thing I do in the complete prototype. Exporting / importing is no substitute since each time I open or save the complete prototype can take 5 minutes and I normally have to consult different screens of the complete prototype.
I use prototyper 4.5 for PC