I have a question about loading more than once a DTS Shape

And it is if it is loaded everytime you click on it in the mission editor or it is loaded only once, and each time you place a DTS shape the engine makes only a reference to the original model loaded in first place. This would be great if it only loaded once, as it would allow to put lots of copies of it, without the overhead of loading it every time you used it. This is the way i think it is done, but really, i have no idea, so, because of this, i'm asking it. I hope this is the right board to ask.