My business partner and I both are running AutoCAD 2014 LT. He is on PC and I am on MAC. We are experimenting to see if we could make the switch to MAC. We printed PDF's of the exact same dwg, his was 400kb, mine was 4mbs. Its a huge issue as consultants can't print my PDFs when they are combined. Is there a print driver or setting or command I am missing? I need these to be smaller... could be a deal breaker for us switching to MAC.

I have read through forums and tried everything I know to no avail. Please help.
Thank you in advance!