Stacking your bets.

[n.s.]

Most dealers (like most players) just want to get in as many hands/hour as possible. It should be clear when betting in a messy pile is going to slow things down (the dealer has to count your bet, in limit or NL, so he will often have to stack it for you).

I usually play in a 4 chips/8 chip structure. Calling a flop bet, closing the action, you can practically splash the pot with your 4 chips and no one will care. However, if you 3-bet the turn with a big messy pile, you are going to slow things down considerably - people won't be sure if you are re-raising or just calling the raise, the dealer will have to make sure you actually put out 24 chips, etc...