A pause before answering makes you look thoughtful, not slow. Most people never use it.

Instant answers feel safer, because a silence can feel like failing a test. From the outside it reads the other way round: the quick reply sounds reflexive and the two-second gap sounds considered. More usefully, that gap is where you notice your first answer was wrong. Hardly anybody uses it, which is part of why it stands out.

Count to two before answering anything that matters this week, in class, in an interview, in an argument at home. It will feel far longer to you than to anyone listening. Use the time to check whether that is really what you think.