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<h3 class="section">1.3 Latency and throughput</h3>
<p><a name="index-throughput-8"></a><a name="index-latency-9"></a>
Most network benchmarks consider <dfn>throughput</dfn>, or the average
amount of data being pushed around per unit of time. While important
for batch applications (for example benchmarks), average throughput is
mostly irrelevant when it comes to interactive web usage. What is more
important is a transaction's median <dfn>latency</dfn>, or whether the data
starts to trickle down before the user gets annoyed.
<p>Typical web caches optimise for throughput — for example, by
consulting sibling caches before accessing a remote resource. By
doing so, they significantly add to the median latency, and therefore
to the average user frustration.
<p>Polipo was designed to minimise latency.
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