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{{main|Latency}}'''Motion-to-photon latency''' also known as the '''End-to-end latency''' is the delay or [[latency]] between the movement of the user's head and the change of the [[VR]] device's display reflecting the user's movement. As soon as the user's head moves, the VR scenery should match the movement. The more delay (latency) between these 2 actions, the more unrealistic the VR world seems. To make the VR world realistic, VR systems want really low latency of 7ms to 15ms<20ms.