Preview.app increases PDF file size.

When making changes to a PDF (in my case, creating annotations), Preview.app will increase the file size of a PDF if that PDF was run through Acrobat Pro's "Reduce File Size" process. For example, I have a PDF that I created using a Book2Net book scanner. I then used Acrobat Pro 10 to OCR the file, then ran Reduce File size which shrank the file size from almost 1.6gb down to about 62mb. If I use Preview.app to make an annotation and then save the file, Preview.app will inflate the file back up to 1.6gb.
An earlier thread (https://discussions.apple.com/thread/1478588?start=0&tstart=0) also discusses a similar issue. I'm not sure if those folks were also working with PDFs that were reduced in size by Acrobat Pro or not.
Anyone else have this issue?
10.6.8 on a MacBook Pro.

That is not normal. same action with acrobat and skim do not do this. Changing file size from 170mb to 780mb (my case) should not be expected.
Preview re-formats the file (which takes a while the first "save"). It may even make scrolling and searching for text faster, but is not desirable all the time.
There is NO explanation from Apple in help or online. Keeping things simple is one thing, having unexpected and unexplained behavior is another.
Last preview update made it pretty much useless for annotations anyways.
Choosing "text" annotation used to allow for clicking anywhere on the pdf and start typing. Now, it automatically creates a text box at the center of page that has to be the dragged (and make sure not dragging other annotations with it). click T multiple times, multiple text boxes on top of each other.
I never thought I would look at Windows users with jealousy. What a bad job they are doing.

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