Speed:
Speed refers to the level of aggressiveness with which you play. Fast play is more aggressive, slow play is more passive. Good players may change speeds so that their play will not be so predictable.
http://www.seriouspoker.com/dictionary.html#speed
I've just been playing alot more shorthanded 600NL and there are spots where I'm not sure how aggressively to play certain hands, or the likelihood I'll be good if I get action, even if I have a big hand. Its not exactly a very secure-feeling spot in a full ring game, I am always cautious with this sort of board. But I'm playing much more LAGish shorthanded...
Would this hand be more interesting if he just called the flop check raise? How about if I didnt raise enough to give myself decent odds if he already had a flush?
How about if I said I'd been beating up on the player for the past hour, cause thats how I do things in 6MAX.