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Reference.org
TCP delayed acknowledgment
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<p>TCP delayed acknowledgment is a technique used by some implementations of the <a href="/facts/Transmission_Control_Protocol/WW4sPrt9">Transmission Control Protocol</a> in an effort to improve <a href="/facts/Network_performance/ALjfw5Nn">network performance</a>. In essence, several <a href="/facts/ACK_(TCP)/WW4sPrt9">ACK</a> responses may be combined into a single response, reducing protocol overhead. However, in some circumstances, the technique can reduce application performance. </p>