Pulled this from comments at
www.shacknews.com ; this is a copy paste:
By: MikkleThePickle
This is an absolute must-have for anyone who has the Acrobat Reader installed (probably most of us):
Adobe Reader SpeedUp
Lets you select which internal plugins should be loaded when Acrobat Reader starts up. Most of these (over 40!) are never used, but Acrobat reloads them every single time and takes forever to start up.
Run the program, click "Speed Up," and you're done.
My load times for PDF files in IE went from over 15 seconds (my browser would freeze) to just under 3 seconds.
http://www.tnk-bootblock.co.uk/prods/misc/index.php
Works as advertised!