wait for green · hit it
nothing yet
This is not a measurement of your nervous system. What it times is the whole loop: this page’s timer, your screen drawing a frame, light reaching your eye, your brain deciding, your hand moving, and your mouse or touchscreen reporting it.
Your display appears to refresh every —, so up to that much of any number above is the screen alone, and none of it is yours.
The honest comparison is your own earlier attempts, which is the only one this page offers. It keeps them in this browser and sends them nowhere.