Printing PDF Drawing problems

Have some Autocad drawings in PDF format of about 1.8mb. When print these drawings they create a print file of about 30mb and take ages to print. Any ideas on how to reduce print file and speed up?

Did you purge the file?

Thanks for reply. Unable to purge as issued to me in pdf format.

I've had this problem before, Deano28. Mine will take forever or they won't print fully. My solution is opening the file in a raster based program (ex. Photoshop) or another vector based (ex. Illustrator) and printing from there.