Slow playing and slow rolling are two different things. You may slow play when you are a newcomer to the game or you hesitate lying or playing with the experts. You may take any longer pauses for checking or calling that are allowed in the game. But if talking about slow rolling, it involves intentional pausing that may hurt someone emotionally especially when the other player thinks he might win and bet for the large pot. Slow rolling poker is considered a false practice in the game as it stretches the game which makes it boring.
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