Acrobat Mac optimizes to bigger file sizes than on Win?

Hello,
I thought I am reasonably savvy when it comes to using Acrobat's PDF optimizer. But recently people have begun telling me that Acrobat Mac seemingly generally produces bigger files than the Windows version. That seems quite unbelievable to me but some preliminary tests do seem to indicate that Mac file sizes are quite a bit bigger than those produced on Windows.
Has anyone heard of this yet or had any personal experience?

So I tried generating the same PDFs on two other computers that have Acrobat 9 Pro.  Results were reproduced.  The verdict is:
- complex PDF files (that is, containing cross-references, tables of contents, and bookmarks) generated by Acrobat 9.x Pro are roughly 2-5x larger than the identical file generated with Acrobat 8.x Pro.
- different PDF conversion settings make a negligable difference (less than 10% rather than 70-80%).
- using the "Reduce File Size" or "Optimize PDF" option cuts the file size roughly in half, almost always resulting in a "image downsampling mask" warning message, which requires acknowledgement (that is a problem for batch processing or automation).
- adding an Acrobat watermark to the file cuts the file size roughly in half.
- just using Save As to another filename has no effect on file size.
- generating the PDF in Acrobat 9 with links but no PDF bookmarks still results in the inflated file size.
- generating the PDF in Acrobat 9 without any links or bookmarks results in approximately the same file size as the Acrobat 8 PDF with full links and bookmarks.
It appears that Acrobat 9's manner of adding links is what's bloating  the files, and in my case it's probably not related to images or image resolution/print quality.  It's a shame, because Acrobat 9 seems to have made some  improvements to the Review Tracker interface, and a few other bells and  whistles which I haven't really gotten around to exporing yet.  But  unless I find a way to keep my links and the PDF file sizes comparable to what I was  getting with Acrobat 8 Pro, it looks like I'm going to stay with Acrobat 8.

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