In the context of VR, latency refers to the amount of time between when your head rotates and when the light coming out of the display reflects that rotation ("

In the context of VR, latency refers to the amount of time between when your head rotates and when the light coming out of the display reflects that rotation ("motion-to-photon"). Too much latency means that whenever you rotate your head, the world you're looking at seems to shake. Wearing a headset with high latency conditions people to hold their head still (they get negative reinforcement from looking around, but don't realize what's happening).