4 ms·

PS/2 Keyboards are faster than a USB keyboard with slow-speed negotiation with the host computer but for USB keyboards with high speed negotiation, they are at

PS/2 Keyboards are faster than a USB keyboard with slow-speed negotiation with the host computer but for USB keyboards with high speed negotiation, they are at par[1] [1] https://www.youtube.com/watch?v=wdgULBpRoXk&t=1766s https://www.youtube.com/watch?v=wdgULBpRoXk&t=1766s

snvzz 3y ago
That's the theory. At "full bandwidth", with frequent polling, in theory, it should be possible to have excellent latency. In practice, if you actually measure time from keypress to event, you'll find that modern "gaming" keyboards are actually laggy[0]. 0. https://danluu.com/keyboard-latency/ https://danluu.com/keyboard-latency/
- Mr_Minderbinder 3y ago
  That article is a joke. >if you actually measure time from keypress to event Nobody measures keyboard latency this way because when you do the keyboards with less key-travel (Apple Magic) end up with lower "latency"; clearly an absurd result and not at all what you are actually trying to measure. It does not line up with anyone's definition of keyboard latency. This article has been posted in response in the other threads: https://www.rtings.com/keyboard/tests/latency https://www.rtings.com/keyboard/tests/latency
  - snvzz 3y ago
    >Nobody measures keyboard latency this way (keypress travel) You'll find most keyboards in your link, despite these fullrate-enabled high poll rates, actually have higher latency from keypress to event than what PS2 trivially achieved. Which, by the way, is consistent with the findings in Danluu's article ("a joke"), showing that pressing 2 keys at once might not be as accurate, but does not completely compromise the results, relative to using a mechanical arm. Note that Danluu documents his methodology, and even expresses that he would prefer a mechanical arm setup. Which is why... >That article is a joke. Is undeservedly unkind.

snvzz 3y ago

That's the theory. At "full bandwidth", with frequent polling, in theory, it should be possible to have excellent latency. In practice, if you actually measure time from keypress to event, you'll find that modern "gaming" keyboards are actually laggy[0]. 0. https://danluu.com/keyboard-latency/ https://danluu.com/keyboard-latency/

Mr_Minderbinder 3y ago
That article is a joke. >if you actually measure time from keypress to event Nobody measures keyboard latency this way because when you do the keyboards with less key-travel (Apple Magic) end up with lower "latency"; clearly an absurd result and not at all what you are actually trying to measure. It does not line up with anyone's definition of keyboard latency. This article has been posted in response in the other threads: https://www.rtings.com/keyboard/tests/latency https://www.rtings.com/keyboard/tests/latency
- snvzz 3y ago
  >Nobody measures keyboard latency this way (keypress travel) You'll find most keyboards in your link, despite these fullrate-enabled high poll rates, actually have higher latency from keypress to event than what PS2 trivially achieved. Which, by the way, is consistent with the findings in Danluu's article ("a joke"), showing that pressing 2 keys at once might not be as accurate, but does not completely compromise the results, relative to using a mechanical arm. Note that Danluu documents his methodology, and even expresses that he would prefer a mechanical arm setup. Which is why... >That article is a joke. Is undeservedly unkind.