We apologize for the inconvenience caused, as per the description above, the Scroll in Acrobat 11 Pro is slow, Is that correct?
Please check for the latest update for Acrobat Pro 11 from Help>Check for updates. You may also try to repair the installation file of Acrobat from Help>Repair installation.
For testing purpose, you may try to disable the Protected Mode from Preferences>Security(Enhanced).
Note: Enable the Protected mode back.
Hope this helps, and keep us posted with the results.
I checked for updates and found an update for Reader available. I did not install this. I checked and protected mode was already turned off. I then did a repair install and checked for updates after a reboot. It said no updates were available. The version is 11.0.22. There is no change in the scrolling.
Sorry for the delay in response to your query and apologize for the inconvenience caused. If the issue is still persisting, please check in a different user account with full admin rights.
Let us know how it goes.