About save as reduced size pdf

I noticed that saving as reduced size pdf shrinks a lot my pdf files.
What does it do precisely? Is there a way, with Acrobat X or some other software, to do the same to a large collection of files in few steps?
Any compatibility problem reading that kind o pdf on mobile devices (BlackBerry, Android, iPhone, WP6 or WP7)?
Bye
Dario

don't think it's the right explanation: incremental updates are removed with a simple "save as" action.
Infact, the size of my files (not modifyed after first creation), doesn't change if I open and do a simply "save as" them.
Size will change with Save as > reduced size PDF... it must be doing also something else that regards the version compatibility: I noticed that setting an higher value in the box asking for Acrobat compatibility level will impact the final size of the file.
Keeping actual level will save, on the test file I'm using, about 4 MB. Setting at 9.0 compat. level will obaint the 4 MB file. The quality of the output pdf is lower than the original, so it's also doing some kind of compression.
An explanation could be: it does file compression using the best algorithm available for the version selected?
PS
Is there a way to get statistics on PDF files, like the space used for incremental updates?
Bye,

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