A clicks per minute (CPM) test counts every press you make inside a fixed interval, then reports the rate you held as clicks per minute.
The CPM tester on this page opens the interval on your first click, timestamps each press against the browser's high-resolution clock, and closes the interval at the second you picked. Nothing counts before that first press, so reaction time stays out of the click rate.
A CPM test produces three numbers a stopwatch cannot: your average click rate across the whole interval, your peak click frequency inside it, and the per-minute click consistency between those two. Gamers read those numbers to check a mouse click speed score before a match, to compare a gaming mouse against a trackpad, and to confirm a switch still registers every press.
Four parts make up the click speed test: the interval selector at 1, 5, 10, 30, 60 and 100 seconds, the click pad, the live readouts for CPM and clicks per second (CPS), and the per-second click profile that shows where the rate fell away.