No matter the size of the PDF (100kb to 10Mb) the loading time is still the same (20-30 seconds).I tried to open PDF files from local hard drive, USB drive, Network drive all have the same problem.Fox it reader runs fine but for policy reason i'd prefer to stick with adobe reader for all machines in the domain.other PCs in the same GPO with the same group policy etc don't have any problem.Adobe Reader versions 9, 10, 11 all have the same problem.On 2 (identical) computer of my network (100+ computer) Adobe PDF Reader open pdf files very slow (about 20 to 30 seconds per file and when the file is opened, if the file has multiple pages, the scroll is 'laggy') First of all i know, i'm sorry, this sound like the classic silly question 'my computer is slow this morning' but if you keep reading you may find out it's not.