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A comment on Measuring keyboard-to-photon latency with a light sensor.

Re:Measuring keyboard-to-photon latency with a light sensor by snarfy on Sunday May 31, 2020 @04:01PM (#23372216)
If you want low latency you really need to use USB3/USB-c. USB3 doesn't use polling like USB2. USB2 latency is measured in milliseconds. USB3 latency is measured in microseconds.
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Re:Measuring keyboard-to-photon latency with a light sensor by trishume on Sunday May 31, 2020 @05:30PM (#23372925)
If you use 1000hz polling like my latency tester and keyboard do the latency becomes less than 1ms which is pretty small compared to the other factors. See https://michael.stapelberg.ch/posts/2018-04-17-kinx-latency-...

I'd optimize lots of other things like trying to avoid the compositor, higher refresh rate monitors and lower travel keys before I'd look at USB3.

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Re:Measuring keyboard-to-photon latency with a light sensor by Zolomon on Sunday May 31, 2020 @04:19PM (#23372362)
First I thought of the message polling in Win32, then I realized you were talking about the hardware. Would have been fun otherwise. :)
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