Comment by mrob
3 years ago
I'm using a Razer Huntsman V2 keyboard, which has 8kHz polling and optical switches. I do not notice any obvious latency from it, and the specification claims sub-millisecond latency from switch activation point. This is better performance than is possible from a PS/2 keyboard, because the PS/2 interface is bottlenecked by the slow serial link.
Just for my own Reference, the link [1] below, 8000hz is 0.125ms. And they show 0.2ms as reference. I believe ( Need to Check up on this ) even with USB 3.0 you will require custom driver to achieve 30-50us per packet transfer.
So that is about 0.175ms.
I know people might think this over the top, but AFAIK this is far cheaper than say to work around latency within the software system. Next we need to work on Display Latency and Display Connection Latency.
[1] https://www.razer.com/gaming-keyboards/razer-huntsman-v2