File size balloons up after annotation

Hi. I've been creating OCR pdfs of scanned books and the resulting files are very reasonable 2-4 mb. However, as soon as I add an annotation such as highlighting, the file balloons up by 10X, 20-40mb. Can someone help me understand why this happens and what I can do about it. I've searched google and this forum but can't seem to find an answer.
Thanks!

Thanks, I'm an avid Acrobat user, there is no problem with file size no matter how I save. But both Adobe Acrobat and Reader are unusably slow when scrolling through entire books. So I use Preview or other highlighting programs. However, as soon as I have to save the pdf with any edit the file size jumps 10 fold.
I need a workaround so MacOSX pdf readers don't increase the size.
Or, a way to get Adobe Acrobat/Reader to scroll properly in MacOSX.
Thanks!

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