Well, it's of course completely normal you'll see a loading pause when several objects are loaded, nothing we can do about it, it's the way the simulator creates new object.
Of course, the *amount* of the stuttering is heavily dependent on how much your simulator is already taxed, and how much your VRAM is already filled. If it's close to exhaustion, the video drivers will have to do more work to accomodate the new textures and models being uploaded to an already almost full video card, so the stuttering will be worse. But it will never be null, there will always be some delay when creating objects.