Ever since I upgraded form 10.0 to 10.3 my export to PDF sizes have dramatically increased. My project is set up using data driven pages with maplex turned on. With it on my PDF sizes go from 8mb to 150mb. Turning maplex off they go back to normal. Created a new project, saved as a 10.3, and still issues. Any ideas on why maplex would be causing this increase in PDF size?