Jitter clicking is the first technique most people find when a plain finger stops being fast enough. The method is simple to state and unpleasant to hold: tense the forearm until it shakes, rest the fingertip on the button, and let the tremor do the pressing.
What it actually produces
A practised jitter run sits between 450 and 700 CPM — 7.5 to 11.7 clicks per second. On the per-second profile it reads as a dense, slightly irregular picket: presses arrive in a near-constant stream, but the gaps between them vary by ten or fifteen milliseconds because a tremor is not a metronome.
That irregularity is the signature. A single-clicked run has wide, even gaps. A butterfly run reads as tight pairs. Jitter reads as noise with a high floor.
The profile is where it fails
Jitter holds its rate for about six seconds. On a ten-second interval the last three or four bars are visibly shorter than the first three, because the muscles producing the tremor are the ones that tire first. On a sixty-second interval it collapses entirely — most people finish below their single-clicking rate.
If you want a jitter number that means something, run the five-second interval. It is the window the technique actually holds.
What it costs
Jitter clicking works by sustaining a static contraction in the forearm, which is precisely the loading pattern associated with repetitive strain. That is not a reason nobody should do it; it is a reason to treat it as a sprint. Three five-second sets with a real rest between them, and stop at the first ache rather than the second.
If the ache arrives during the warm-up rather than at the end of a set, the technique is not the problem — the accumulated load is. Give it a week.