To open PDF files very fast do this:

Go to Adobe Acrobat installation directory,If you have installed it in the C drive,then path will be for : eg: C:\Program Files\Adobe\Acrobat 7.0\Reader\

Move or cut out  everything from the “plug_ins” directory & paste it into the “Optional” one, this will stop all unnecessary plugins from loading up automatically whenever you open the PDF files hence speeding the overall application ,resulting in fast retrieval of pdf’s….