Just though I'd pop and mention this excellent utilty called PDF SpeedUP, it's freeware.
You can download it here or read about it here.
Thanks to larkware.com and the Daily Grind - an excellent blog, with news you can use (at least if you are a software oriented geek :-))
I used it and it works as promised, speeds up acrobat speed by 10 fold. you only need to run it once, or if you want to restore a specific plugin then maybe once more... Who would of thought a one time use utility can be so usefull.
Update: If you alread installed GoogleDesktop and enjoy it, you will probably want to install this Addin/Replacement right now. It indexes a lot more file extensions (actually you can configure it to index whichever you want....)
Highly recommended, however, note that these are HACKED binaries so installation is at your own risk (make sure you follow the readme.txt file to the dot...).
This one from Scott Hanselman's ComputerZen.com blog