You don’t owe anyone a reply in four seconds. A calm answer later beats a panicked one now.

Speed of response has quietly become a measure of respect, though nobody actually agreed to it. The expectation is a side effect of the devices rather than a real obligation, and meeting it costs you exactly the thinking that would have made the answer good. A fast reply is often a rushed one in better clothes.

Give yourself a delay that belongs to you, an hour, an evening, whatever fits the message. Answer when you have something considered to say. Very little loses anything in that gap, and most of it gains.