I have looked at the PDF files you uploaded for me. A few thing that come to mind:
- Some of these Fill patterns are pretty dense, which means they take quite some time to draw in Acrobat. You could try to make them less dense, if it is feasible.
- Fill pattern Pens have a thickness. I am wondering if it would make any difference if Fill Pattern Pens were hairline Pens. You could test this by creating a new Pen Set based on the current Pen Set used, but in this new Pen Set you would set the thickness of all Pens used for Fill patterns to zero. This could potentially make the PDF lighter and faster to redraw. (Of course the other option is to use the Hairline option in the PDF Option Dialog, but you may want line thicknesses in other elements.)
But the main issue seems to be the "non-flattened" way of saving these PDFs. When I open the PDF and Pan around in it, I can see that a lot of drawing content is drawn, only to be then covered with a large Fill. These elements shouldn't be saved with the PDF file to begin with. And if I understand correctly, this behaves the same even if Layers are not saved to the PDF.
I would recommend that you create a wish for a "Flatten View content before saving as PDF" option in the PDF Options Dialog. That would be a very useful and intelligent option for ARCHICAD and I am sure users would support the wish. We could then vote for it and submit it to GRAPHISOFT as a wish.
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