How to check keyboard response time?

Question

Keyboard

Please tell me how to find out the response time of the keyboard in milliseconds (PS / 2 or USB ports), there are a lot of such programs for mice (almost any gaming mouse driver + independent mini-programs), but not a single one for the keyboard.

Answer 1

I think no software will show this if such a function is not implemented in the keyboard itself. The most reliable way is to use a high-speed camera that could record the time between pressing a key and updating the image on the screen, but in this case, the delay of the OS, the program that responds to the keyboard, the frequency of the monitor (60fps is 16ms) and the speed pixel updates on the screen.
For the ultimate test, you need a specialized device that would electrically close the contact of the keyboard, and to which this same keyboard would itself be connected. The microcontroller measures the time between closing and the arrival of a signal from the keyboard. This will be the real desired keyboard delay.
This functionality is, for example, Arduino -arduino.cc/en/Reference/USBHost
Here is an example video with a mouse - renderingpipeline.com/2013/09/measuring-input-latency

Answer 2

Compared to mice, keyboard key travel is noticeably longer. The travel time can also be measured in milliseconds. Therefore, the task of finding the response time is meaningless.
As the manufacturer indicates (and then if he does), then it will be so.