Scroll Speed and Smoothness Test
Roll your mouse wheel, swipe a trackpad, or drag on a touchscreen inside the test area to measure scroll speed in pixels per second, smoothness, and input pattern.
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How it works
When you scroll inside the test box, the browser fires wheel or touch-move events. Each event reports a distance change in CSS pixels and a high-resolution timestamp. The tool sums the total pixel distance traveled over the active window and divides it by elapsed time to calculate your speed in pixels per second. At the same time, it inspects the spacing and step size between individual events to estimate scroll smoothness and assign an input label: mouse-like for stepped wheel notches, trackpad-like for fine two-finger momentum, or touch for direct finger drags.
Steps
First, place your cursor inside the test card or rest your finger on the touch target area. Second, scroll continuously using your mouse wheel, laptop trackpad, or touchscreen for a few seconds until the readout stabilizes. Third, stop scrolling to review your peak and average pixels per second, your smoothness score, and the detected input type, or reset the counter to start a fresh run.
Controls
The primary readout shows speed in pixels per second, reflecting how much page distance your input requests over time. Smoothness describes how evenly spaced the scroll events arrive, contrasting large discrete jumps with fine, steady increments. The input label displays mouse-like, trackpad-like, or touch based on step patterns. You can reset the current run at any time to clear the numbers.
Examples
A standard notched office mouse rolled at a casual pace might read around 1,200 pixels per second with lower smoothness and a mouse-like label because each physical detent sends a fixed jump. A quick two-finger flick on a laptop glass trackpad might reach 4,500 pixels per second with high smoothness and a trackpad-like label due to inertia events. A rapid thumb swipe on a phone often hits 6,000 pixels per second or higher under the touch label.
How to read your result
Your numbers reflect a combination of your physical hand movement, your hardware design, and how your operating system and browser translate scroll events. A higher pixels-per-second figure simply means the browser received larger delta values over that time window, which is common when flicking a free-spinning wheel or using kinetic trackpad momentum. These figures are a practical way to compare two devices or check OS scroll settings, not a formal hardware grading standard or a measure of physical ability.
Reference ranges
These rough comparison bands are for everyday device checking and are not a medical, psychological, or clinical scale. Many people land around 500 to 2,000 pixels per second during normal reading or casual browsing with a stepped mouse wheel. Fast scrolling or energetic two-finger trackpad flicks commonly fall between 2,500 and 6,000 pixels per second. Free-spinning mouse wheels, aggressive touchscreen swipes, or high OS scroll multipliers can push past 8,000 pixels per second. Smoothness is typically higher on trackpads and touchscreens than on notched scroll wheels.
Tips
For a consistent desktop run, keep the cursor still inside the test area so the browser does not split events between the page and the card, and note whether smooth scrolling is enabled in your browser settings. When comparing two mice, test them on the same USB port and keep your OS lines-per-notch setting identical. On a phone or tablet, use steady vertical swipes inside the box and avoid triggering pull-to-refresh at the very top of the screen.
FAQ
What does this scroll test measure and what does it not claim?
This tool measures browser-reported scroll deltas in pixels per second, event timing regularity for smoothness, and whether the pattern looks mouse-like, trackpad-like, or touch. It does not measure raw hardware sensor latency, mechanical encoder wear, or physical finger speed outside what the browser reports.
Why can two runs on the same device give different numbers?
Most operating systems apply scroll acceleration, meaning a slightly faster flick multiplies the pixel distance per event. Browser background tabs, display frame rate drops, and minor changes in how long you sustain the scroll gesture also shift your pixels-per-second average and smoothness readout between runs.
How do I run the scroll speed test on a phone or tablet?
Tap and drag your finger vertically inside the test card rather than on the outer page margins. The tool reads your touch movement directly, calculates your speed in pixels per second, evaluates smoothness, and sets the input label to touch once the swipe registers.
Where are my scroll speed results kept?
All measurements stay inside your browser on this device. Nothing is collected, transmitted, or uploaded to any server. If the tool saves your personal high scores between visits, that data is stored only in local storage on your own device.
What do a high result and a low result usually mean here?
A high pixels-per-second result usually indicates a fast flick, a high OS scroll speed setting, or inertia scrolling on a trackpad or free-spinning wheel. A lower number simply reflects slower movement or smaller per-notch settings. Neither result represents any health, motor, or psychological assessment.
Privacy
This page runs entirely in your browser on this device; no scroll results or usage data are collected or uploaded, though personal high scores may be saved in local storage on this device.