Reset PRAM, should solve that.
Are you talking to me? About the 20 second delay on boot up?
About This Mac>More Info>System information>System Report>Serial ATA>Revision
System Preferences -> Startup Disk -> Select your hard-drive in the list
I did that, I'm running SD26 and I'm not having the problems I used to have. The booting delay to the apple logo has been reduced to 7 seconds all by itself. I think it's still learning my habits as far as usage goes.