There has been some progress with the topic:
As Dave Blatner pointed out, adding transparency to a figure and exporting to pdf using the PDF/X-1a preset will remove all hidden information from the Illustrator vector graphic included.
However, this preset does not support interactivity:
InDesign produces a warning, stating that all interactivity will be lost and one should use PDF 1.5 or higher to support interactivity.
Unfortunately, these PDF versions do not support "Transparency Flattener" anymore - putting me back to start.
But maybe I can form my question a bit more specific now:
How can I drop all information on an exported pdf page that is not visible (while still having interactivity)?
Any hints are gratefully acknowledged.
Unfortunately, I have no answer, but I'm faceing the same problem. I get giant PDFs after export and nothing (I know) works for proper compression or optimisation.
I get a window though, about dropping infos about the file upon saving, but this results in a poor quality file.
So if anyone could cast a light on this?! Thx! - Mel
I've run into this issue as well when working with complex Illustrator graphics. Although vector graphics are always much small than the equivalent raster version, when vector graphics get complex, they can be fairly large in size as well and forcing the graphics to raster isn't a very elegant solution since you'll lose the crisp lines obtained in vector. One suggestion I can make is to try increasing the compatibility level. The higher the compatibility, generally the smaller the file. I don't know if it will make enough of a difference to help, but it could save you a few MB. You could also try using a tool such as PitStop to clean up the file, but that would need to be done after the PDF file is generated.