An intuitive way to sense latency is to drag you finger and see how far behind the cursor trails. Research showed that people can perceive even quite low laten

An intuitive way to sense latency is to drag you finger and see how far behind the cursor trails. Research showed that people can perceive even quite low latency: http://www.techspot.com/news/47784-advances-in-touch-screens-promise-1ms-input-lag-instead-of-100ms.html http://www.techspot.com/news/47784-advances-in-touch-screens... (NOTE: the article incorrectly states this is a device - it is NOT, it's just an experimental setup to measure latency perception, i.e. fake.) I would expect the whole processing path - touch, bandwidth, CPU, RAM, OS, app, GPU, display - to factor into latency, just as it does for VR (see John Carmack's talk on latency for Oculus Rift). Interestingly, mouse cursors seem instant to me (below perceptible latency), though it's slightly harder to tell, because the mouse isn't on the screen (and if you put it on the screen, the scaling is way off).