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CPS Test

Clicks per second over a short burst.

Five seconds, as many clicks as you can.

Worked example

The test lasts five seconds. 30 clicks in that window is 6.0 clicks a second.

FAQ

When does the clock start?
On the first click. The next five seconds count every click, including that first one.
Is this the same as reaction time?
No. Reaction time is one response to a signal. This is how many clicks you can make in five seconds.
Can I use a keyboard?
The button is a click target. A mouse or trackpad click is what it counts.