SPS, explained honestly
Scrolls per second counts browser wheel events. That is a precise thing to measure and a slippery thing to interpret, so it is worth being blunt about it: one turn of a detent does not reliably equal one event. A high-resolution wheel can report four or more events per notch; an older mouse reports one; a touchpad has no notches at all and reports a continuous stream.
So SPS is a fair contest between two people using the same class of device, and a meaningless one across classes. That is the same caveat that applies to every scrolls-per-second scoreboard on the web — most just do not say so.
Scrolls per second rating scale
| Tier | Range | What it means |
|---|---|---|
| Slow | 0–3 scrolls/s | Reading pace. Normal for careful scrolling through text. |
| Normal | 4–7 scrolls/s | Everyday browsing speed for a detented mouse wheel. |
| Fast | 8–12 scrolls/s | Deliberately quick flicks, or a touchpad with momentum. |
| Very fast | 13–20 scrolls/s | Sustained rapid input. Common on free-spin wheels. |
| Extreme | 21+ scrolls/s | Free-spin flywheel territory, or a very high wheel resolution. |
These bands follow the convention used across the click-speed category, so your score here is comparable with the number you would get elsewhere. If you would rather measure distance than events, the scroll speed test reports pixels per second from the same engine.
SPS by input type
Detented mouse wheel (4–14 SPS)
A physical click per step. The detent spacing is a hard ceiling on how fast the wheel can be driven, so scores cluster tightly and are highly repeatable.
Free-spin wheel (20–60+ SPS)
With the ratchet released the wheel becomes a flywheel. One hard flick keeps emitting events for a second or more after your finger has left it.
High-resolution wheel (2–4× a plain wheel)
Emits several small-delta events per notch by design. The distance travelled is comparable to an ordinary wheel; the event count is not.
Trackpad (60–120 SPS)
A continuous event stream plus a momentum tail after lift-off. Excellent distance and event scores, but a different sport entirely.
The mouse vs touchpad guide goes into why the event streams differ so much, including delta units and momentum.
If your SPS looks wrong
A score well below your normal range, or one that swings run to run, is usually one of three things: a wheel encoder dropping events, a browser coalescing input under load, or a wireless link reporting in bursts. The quickest way to tell them apart is to look at the shape of the run rather than the headline figure.
Run the mouse wheel test — it records inter-event gaps, bursts and direction reversals — or compare against your click rate on the CPS test, which uses the same event pipeline for a completely different button.
Scrolls per second questions
SPS means scrolls per second: the number of wheel events your browser receives each second. It is the scroll-wheel equivalent of CPS (clicks per second) and it is the figure the click-speed community compares, because unlike a pixel distance it barely moves when you change your operating system’s scroll settings.
0–3 SPS is a reading pace, 4–7 is ordinary browsing, 8–12 is fast, 13–20 is very fast, and 21 or more is extreme. Most people with a standard detented wheel top out in the low teens. Free-spin wheels and high-resolution wheels routinely break 30 because they emit several events per notch.
No, and this is the single biggest reason scores differ between mice. A high-resolution wheel can emit four or more events for one detent, while an older mouse emits exactly one. Both are honest browser observations, but only the second one lets you read SPS as notches per second. Treat SPS as an input-event rate, not a count of physical clicks of the wheel.
A two-finger flick on a trackpad generates a continuous stream of small events, then keeps generating them after your fingers lift while momentum decays. Sustained rates of 60–120 events per second are normal. That is a real measurement of what the browser received, but it is not comparable with a mouse wheel — filter your comparisons to one input type.
Release the wheel’s ratchet if your mouse has a free-spin mode, use longer strokes from the second finger joint rather than fingertip taps, and keep the wheel and its encoder slot clean — a wheel that drops events costs you SPS directly. Raising the operating system’s lines-per-notch setting does not help here; it increases distance travelled, not the event rate.
Browsers coalesce input events under load, so a busy tab, a heavy extension, or a background download can flatten the measured rate. Run the test again on a quiet tab, keep the window in the foreground, and use the same duration. If the gap persists across several runs, the mouse wheel test will show whether events are being dropped mid-stroke.