“Adobe Reader Speedup”:http://homepage.ntlworld.com/bootblock/files/misc/ar-speedup.zip does what it says (by telling Acrobat not to load up a lot of plug-ins you probably weren’t using anyway). While there is a “restore” option it only works once so if you do discover later that you need to use a tool you removed you may have difficulty in restoring your settings without reinstalling Acrobat. Still, it’s probably worth doing for most Acrobat users.
Thanks to Need To Know 2004-02-20 for the link