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240 A similar source of latency is USB scanning. The USB protocol pulls input from the keyboard, so the keyboard needs to wait for the USB scan to send its key presses. Low speed USB scans at 125hz, introducing an unavoidable ~8ms max and ~4ms average delay. More recent USB versions scan at 1000hz or more, minimizing the latency impact. There are many other potential sources of latency in input de
latency.txt p�5� V �1� V Latency Comparison Numbers (~2012) ---------------------------------- L1 cache reference 0.5 ns Branch mispredict 5 ns L2 cache reference 7 ns 14x L1 cache Mutex lock/unlock 25 ns Main memory reference 100 ns 20x L2 cache, 200x L1 cache Compress 1K bytes with Zippy 3,000 ns 3 us Send 1K bytes over 1 Gbps network 10,000 ns 10 us Read 4K randomly from SSD* 150,000 ns 150 us
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