Fish love to wait till the turn to push their sets

You generally miss some value bets when you don't play sets fast. Your hand is well disguised. On your better days, you will get villains who overplay TPTK and two pair.

Perhaps, an appropriate time to play slower is in a 6-max game and you are heads-up on a flop, when you are sure the flop missed your opponent (rainbow, 1 big card, etc)