Where the name comes from
Kohi was a Minecraft PvP server from the 1.7 days, and the click test on its website turned into the way players compared speed. The server is long gone. The format stayed: click for 10 seconds, read the average. When somebody says they "click 9 on Kohi", this is the test they mean.
So this page is locked to 10 seconds. The mode picker is gone on purpose, because a Kohi score at any other length isn't a Kohi score.
What I added to the original
The old test gave you one number. You get the same number here, plus the peak second, a cadence score, and the Second half box, which says how much you slowed down after the five second mark. For PvP that last one is the interesting one. A fight lasts longer than a burst, and clicks you can still produce at second nine are worth more than a flashy second one.
Does CPS still matter in Minecraft?
It depends on the version. Java Edition 1.9 added an attack cooldown, so on modern vanilla servers spam clicking does less damage than timed hits. Click speed matters on 1.8-style PvP servers, on the many networks that still run 1.8 combat rules, and on Bedrock Edition, which has no cooldown.
Even there, more isn't always better. Most servers cap or flag clicks somewhere between 15 and 20 a second, and a steady 8 to 10 with good aim wins more fights than a shaky 14. If you are practising for PvP, train until the Second half number stays near zero before you chase a higher average.
Quick answers
Is this the same as a 10 second CPS test? Yes. Same maths, same engine as the CPS test on the front page, with the spacebar switched off so only the mouse counts.
Can I jitter or butterfly on it? Of course, and the Technique box will try to name what you did. The dedicated jitter and butterfly pages show more detail.