Curious question for drawing database issues. When copying and pasting entities from one drawing in to another, it brings far more "stuff" with it than is selected. i.e. I have a clean AutoCAD 2013 drawing of 200k and I get another 7meg drawing from a consultant that is obviously bloated, but I only need to grab a small area of the drawing to update say a mechanical room or pad layout or size. I select the items I need and paste them in to my drawing. The items I need are probably less than 5-10k in size. Once these items are pasted in to my drawing BOOM, it blows up to 7meg because it brings in a bunch of unselected items.
and these items are typically unpurgable. I then typically use a Wblock all or dxfout on nasty ones to get it down to size.
I have written scripts and macros to deal with drawing cleanup and have even written an article on it, but what puzzles me is why this happens. Can anyone educate me on what is really happening and why?