Adobe Reader SpeedUp is a utility for speeding up the opening of PDF pages. Some of these pages can take ages to open, so anything that knocks a bit off the time must be a good thing.
It works by preventing the loading of rarely used parts of the program called 'plugins'. The speed-up option can easily be reversed if necessary. Also, if Adobe Reader needs a particular plugin to display a page it can be enabled individually (although I haven't noticed any pages
not displaying properly since using the utility).
It can be found at the top of
this page