Buttercup
Princess of Florin
Halivar said:2) Prerolling encounters.
I actually do this, sort of. I have encounter tables set up, that say something like this: Four times a day, roll a d10. Then I list what happens with each possible result. If one of those is, say, an ambush by 1d12 goblins, then I have 12 goblin counters handy, and a stat block for goblins with a range of hitpoints.
I just started doing this a couple of months ago, and I think makes my games go much more smoothly. It's not like I'm taking all the chance out of the session, I'm just planning for it.

Also, since I write all this up in Word, I cut and paste monster stat blocks into another document, which is in alphabetical order. Then, the next time I need goblins, I just cut and paste them into my current adventure notes.