Free Mouse Latency Test for Click Delay, Jitter, and Consistency
Measure browser event timing, click-hold duration, click-to-click intervals, jitter, and consistency in a controlled local session. The tool separates useful browser-side timing signals from claims a webpage cannot make about true end-to-end hardware latency.
Free Mouse Latency Test for Click Delay, Jitter, and Consistency
Use the live controls below, then review the explanation, limits, checklist, and comparison guidance before acting on the result.
20-click consistency challenge
Click the pad with a normal, repeatable motion. Avoid gaming the minimum; the tool rewards stable samples.
0 of 20 target clicks
Session settings
The browser event-delay proxy is calculated from performance.now() - event.timeStamp when the clocks are compatible. It is not total hardware latency.
| # | Event delay proxy | Hold duration | Inter-click interval | Flag |
|---|
Built for an actual decision, not a single output
Live click-event delay proxy
Click-hold duration tracking
Inter-click interval analysis
Median, mean, minimum, and p95 timing
Jitter and standard-deviation score
Automatic outlier flags
20-click consistency challenge
Live timing chart
Session history stored locally
CSV export for raw samples
Browser and pointer diagnostics
Copy, download, print, and reset controls
How to run a meaningful mouse latency test
A browser mouse latency test can observe when pointer events are timestamped and when your page receives them, but it cannot isolate every stage between the physical switch, mouse firmware, USB or wireless transport, operating system, browser scheduling, display refresh, and pixel response. Treat the event-delay number as a browser-side proxy rather than a laboratory measurement of total hardware latency.
For a cleaner comparison, close heavy background tasks, keep the browser tab focused, use the same USB port or wireless mode, keep power settings consistent, and collect at least 20 clicks per condition. Compare medians and p95 values instead of relying on a single fastest click.
Click-hold duration and inter-click intervals are user-input metrics, while the dispatch-delay proxy compares the event timestamp with the page's high-resolution clock. Large spikes can indicate scheduling pauses, background work, thermal throttling, browser extensions, or a temporarily busy system.
Worked example: wired vs. wireless comparison
Collect 30 clicks in wired mode, export the CSV, reset, then repeat with the same mouse in wireless mode. Compare the median event-delay proxy, p95, and jitter. A lower median with fewer high outliers is more convincing than one unusually fast sample.
Understand the result before you trust it
Event timing is not total hardware latency
A webpage sees browser events, not the complete physical-to-photon path.
Median resists one-off spikes
The median is usually more useful than the minimum when a few samples are delayed.
p95 reveals slow-tail behavior
The 95th percentile shows the boundary below which most recorded samples fall.
Jitter describes inconsistency
Standard deviation and spread help distinguish stable timing from erratic timing.
Sample size matters
Twenty or more samples provide a more stable view than two or three clicks.
Environment matters
Power modes, browser load, background apps, and wireless interference can change results.
Key checks, formulas, and limitations
| Metric | What it means | Use it for | Do not overclaim |
|---|---|---|---|
| Event-delay proxy | performance.now() minus event.timeStamp | Browser-side comparison | True switch-to-pixel latency |
| Hold duration | Pointer up minus pointer down | Click technique and switch feel | Polling rate |
| Inter-click interval | Time between pointer downs | Cadence consistency | Device latency |
| p95 | 95th percentile timing | Slow-tail comparison | Worst possible latency |
| Jitter | Sample standard deviation | Consistency comparison | Root-cause diagnosis |
Three quick checks
Quality-control checklist
Recent saved summaries on this device
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Mouse Latency Test: FAQ
Is this mouse latency test free?+
Yes. It runs in the browser with no signup, email, phone number, or payment.
Does it measure true hardware click latency?+
No. It measures browser-visible event timing and related click metrics. End-to-end hardware latency requires specialized measurement equipment.
Why do some samples spike?+
Browser scheduling, background work, power management, wireless interference, extensions, and system load can produce delayed samples.
How many clicks should I record?+
Use at least 20 for a quick comparison and more when small differences matter.
Can I compare two mice?+
Yes. Keep the system, browser, port or receiver placement, and test procedure as consistent as possible.
Use the result responsibly
This page is an educational browser-based tool. It cannot replace specialized measurement equipment, professional accounting, legal review, tax advice, compensation advice, procurement policy, contract review, or organization-specific procedures when those are required.
External reading: MDN MouseEvent reference.