Why is "Document Compare" so horrendously slow in Acrobat X?

In Acrobat 8, it used to be possible to compare the text of two large (900+ pages) documents in a few minutes.  I just installed Acrobat X, and now these comparisons take much longer.  Is there any quick way to compare two large documents and see which pages have changed?
The new behavior is definitely not an improvement.

I also just installed Acrobat X. I get the below:
"Acrobat could not compare the documents completely.  Do you want to see the report anyway?"
This I believe is because PDFs larger than 250pages.
The comparison does not find any change.
The new behaviour is definitely not an improvement.
An upgrade which removes functionality.

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