Does anyone in the NYC area have a pre-2000 PC with CRT I use to do some input-to-screen latency measurements?
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I've started measuring keypress -> USB latency with a logic analyzer and I'm seeing some measurements in the 20ms to 30ms rangepic.twitter.com/nzUPYMS2rn
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Is this plausible? 20ms to 30ms for a keypress seems absurd. OTOH, it's consistent this person's experimenthttp://forums.blurbusters.com/viewtopic.php?f=10&t=1836&sid=080b1b6a517ed1eb6988627c48da080c&start=10 …
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They start measuring from internal switch activation and I start when the key moves, so that could explain the 10ms difference.
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Also, does anyone in the NYC area have an "interesting" keyboard I can borrow to test?
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So far, I've tested a couple gaming keyboards and a bunch of other "normal" keyboards. The gaming keyboards haven't been faster.
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Interesting! When measuring MIDI latencies I noticed jitter threw me off way more than the actual latency - wonder if that'd apply here too?
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Yeah, seems like it should. Most keyboard latency is probably jitter inducing (USB polling, matrix polling)
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that's about right, yes. Keyboards are actually bad because a lot of them have fairly low scan rates to begin with.
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(I think some "gamer" keyboards have higher?)
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OnLive found shockingly high delay on a fair number of game controllers. Local controllers are often slow.
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Yes not unusual. Unplug other devices when doing the measurement as some can cause input lag to increase for the whole machine.
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