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Pointer Latency
source link: https://rsms.me/pointer-latency/
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dispatch → requestAnimationFrame: avg/min/max - / - / - ms
This measures the time between an event being dispatched in the document and
the event being read in a requestAnimationFrame callback function.
This is a good measure for the average input delay a game would experience. requestAnimationFrame(() => sample = now() - ev.timeStamp)
Note that an input event is usually delayed by 5-20ms on top of the delay you see above; the time it takes an event to be queued in the OS until the web browser app has received it and processed the event.
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