The full version of Acrobat allows you to open a PDF created by ArchiCAD and reduce the file size somewhat. Generating a PDF using the full Adobe drivers and workflow may also result in lower file sizes initially. Scale and sheet size do not affect file size. What counts is how many lines (vectors) you have. Placed graphics (rasters) and even placed PDFs inside your project will also add to PDF file size.
A few observations about PDF workflow and architecture:
1) ArchiCAD makes sickeningly large PDF files. It is just not efficient at making PDFs as other apps.
2) I'm with Ben. Everyone doing this gig needs to invest in the full Acrobat product. It is incredibly useful, well beyond ArchiCAD.
3) The best way to reduce file size is to break the file up into several chunks of 3-10 pages apiece
4) Working with Architectural PDFs means email is a lousy method of document communication. Invest the time and (not very much) $$ to set up a good secure FTP site.
HTH.
Nattering nabob of negativism
2023 MBP M2 Max 32GM. MaxOS-Current