High Quality Content by WIKIPEDIA articles! TCP delayed acknowledgment is a technique used by some implementations of the Transmission Control Protocol in an effort to improve network performance. However, in some circumstances it can in fact reduce performance. The socket level tries to guess what the application level is doing, in order to manage communications efficiently. Often it guesses wrong. If the socket layer immediately acked every thing, this would result in a lot of wasted acks, as usually the application sends a response shortly after receiving something, so we would be issuing two acknowledgments, one from the socket layer, one from the application layer. So the socket layer waits one or two hundred milliseconds, and if there is still nothing to send, sends an ack.

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