Printing PDF on a MAC

[JL DRAFTING]

ACAD has allowed importing PDF for years. Anytime I import a data sheet in PDF format into a drawing, the system goes dead slow on the layout that it is attached to. File sizes are big as well. I contacted support to see if there is something I might be doing that would cause the problem and it isn't anything that I'm doing. I did look for some information about PDF's and there are two formats. Raster and vector. Raster images are the bigger problem.