Scroll Speed Test
Test mouse wheel or trackpad scroll input with challenge and free diagnostic modes.
How to use this test
Choose the 5-second challenge or free diagnostic mode, place the pointer over the test field and scroll using the wheel or trackpad. The tool normalizes browser wheel units before calculating rates.
How the measurement works
WheelEvent deltas can be reported as pixels, lines or pages. The test normalizes deltaMode values, counts wheel events and reports normalized movement per second, peak event delta and direction changes.
How to interpret results
Events per second describes input frequency while normalized pixels per second represents scroll activity. Trackpads and wheel mice can still feel different, so compare like-for-like devices rather than treating the number as a universal hardware benchmark.
Troubleshooting tips
Use the same browser and OS scroll settings for comparisons. Smooth-scrolling extensions, accessibility settings and precision touchpads can change event size and cadence.
Related tests
You can also browse every utility from the complete tool index.
Common scroll questions
Why does my mouse wheel scroll too fast or too slow?
Operating-system scroll settings, mouse software, smooth-scrolling extensions and the wheel hardware can all change scroll distance and event cadence. Compare the same browser and settings before assuming the wheel is faulty.
Read full answer →Is trackpad scrolling comparable to mouse-wheel scrolling?
Not directly. Precision touchpads often generate many small smooth events while notched wheels can generate fewer larger events, so compare each device against its own previous results.
Read full answer →Why does my scroll wheel sometimes move backwards?
Intermittent reverse steps can come from a dirty or worn wheel encoder, driver behavior or gesture processing. If reverse events repeat across apps and browsers, inspect or clean the wheel and test another device.
Read full answer →Why are trackpad and mouse-wheel scores different?
Precision trackpads and wheel mice generate different WheelEvent sizes and cadences. The test normalizes units, but the devices still use different input behavior.
Read full answer →