Having updated Adobe Reader XI on several machines I have noticed that it can be really slow to open up and display the PDF file you are trying to view. So here is the quick and easy tip that will make Adobe Reader XI open up much quicker.
Open up Adobe and then hold down the CTRL key and hit H (CTRL+H). This hides the comment pane on the right hide side and puts Adobe Reader into read view mode. Now close out of Adobe.
Now open up a PDF file you have on your desktop or email and Adobe so load up much faster without the comment pane.
Let me know if this helped you by leaving a comment below.