Spacebar Reaction Test
Same test, react with the spacebar — your keyboard hand vs. your mouse hand.
Is the spacebar really faster?
For most people, a keypress lands a hair quicker than a mouse click. A key switch actuates partway through its travel, and the finger you rest on the spacebar barely has to move — while a click asks a fingertip to press down through a full switch. The difference is small, usually 5 to 15 ms, but it is real and it is measurable.
Everything else is the classic test. The panel sits red through a random 1.5 to 5 second delay, then flips green, and a clock started at the exact frame your screen painted that green stops the instant your key goes down — on keydown, not keyup, so your own key-release time never lands in the score.
We run it five times and take the median. Run the classic click test as well and your stats page will hold the two medians up against each other, so you can see your own keyboard-versus-mouse margin rather than trusting ours.