Th cropping area only applies if you are interested in a very small subset of a large flight. For AutoCAD xref you are going to notice performance issue once you hit an image file size of about 50mb in my experience. Not necessarily the physical size of the image because physical size*resolution=filesize. My machine is running a 7th gen i7 with 32gb of RAM and an invidia quadro m2200 and I hit the wall at about 125mb…