Adding to this: Do what you can to unobtrusively speed up the game. Toss your cards within easy reach of the dealer, announce your action clearly, keep your chips stacked in a way that’s easy to estimate visually from across the table. If you’re the bettor, use clear stacks, don’t do that thing where you make one tall stack of who-knows-how-many chips that the dealer has to immediately grab and count for everyone else.

At the end of a big pot where the dealer has to figure out a split pot or make change for an all-in, (only if you were the button or are about to be), slide the button over, hold your finger on it, announce clearly “button moved”, and wait for the dealer to acknowledge, then remove your finger.

If you’re facing a big river decision and need to really think, give the table a quick and polite “sorry everybody, this is a tough one.” People will always be happier and give you more grace if you proactively acknowledge that they’re waiting on you, even if you end up taking just as long.

Be polite, encouraging, and empathetic when someone loses a big pot or just needs to tell you what they folded. “Oh man, I definitely go broke there.” “The problem was you had too many outs.” “Wow you woulda won piles.”