Acrobat X Standard - slow to open (with workaround)

I have an issue with Acrobat X Standard (10.1.5) occuring in a consistant manner on many machines: opening any pdf takes 5-8 seconds. During this time the cursor spins, but the pdf does eventually happen. The *only* fix for this issue is remove the Annots.api file from within the C:\Program Files (x86)\Adobe\Acrobat 10.0\Acrobat\plug_ins directory. When this file is removed (or renamed) Acrobat will open pdf documents in less than a second.
This is 100% consistant behavior, and workaround, across many computers. It does not seem to matter if this is a 9.x to X upgrade, or a fresh installation of X. This is a show-stopper that prevents deployment of Acrobat X Standard to thousands of workstations.
What, exactly, does Annots.api do? I am assuming it is needed to perform some annotation/comment functionality and it would be unwise to remove this file from all computers. I would be happy to send a copy to an Adobe support representative, otherwise I would like to know if this is a known-issue or if there is a more suitable workaround.
Details:
Windows 7 x64 professional
Acrobat X Standard with latest 10.1.5
Appears to be any pdf (a simple one-page doc, form, embedded active content, etc)

[discussion moved to Acrobat Installation & Update Issues forum]

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