Adobe Reader XI Shows Poor Performance.

Hi there!

I've been using acrobat for a few years now , but the Acrobat Reader XI , its showing poor performance rendering a Big PDF file Like 2.8MB (its a MS Proyect Exported Document)..and I have tested it with another PDF viewers and it works fine. Any AR Bug maybe. FYI it complete freezes the Computer. (Im using a Core i3 W7 Pro x64 bits , 4GB , so the PC is not the problem) . I have tested in  2 pcs and i got the same results.