Mouse Latency Test

Measure your mouse input lag and response time right in the browser.

0.00ms

Processing Lag

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Awaiting input

Move your mouse here to testVisual Lag mode

The amber dot lags the green cursor — the gap is an illustration of input lag.

—Min / Max

—Jitter (ms)

—Consistency

—Average (ms)

0Samples

Hardware note: browser-based tests cannot read your actual hardware cursor position. These results show event-processing delay, not total system latency. Chrome and other browsers may coalesce mouse events, which can affect readings.

This free online mouse latency test measures the input lag between your mouse and the browser across three modes — Visual Lag, Event Timing, and Click Latency. Track live processing lag, jitter, consistency, sample count, and your effective polling rate, then compare your result against competitive-gaming benchmarks.

Latency starts with polling rate. A higher polling rate cuts input lag — measure yours with the Mouse Polling Rate Test.

Mouse Latency Test Guide

What Is Mouse Latency?

Mouse latency (input lag) is the delay between physically moving your mouse and seeing the cursor respond on screen. It is measured in milliseconds (ms) and determines how responsive your mouse feels. Lower latency means faster response times — crucial for competitive gaming, precise design work, and general computer-use comfort. This browser tool measures the slice of that delay it can see: the time between an input event being stamped by your system and the page processing it.

What Affects Latency?

• Polling rate: higher polling rates (1000 Hz vs 125 Hz) report your mouse position more often, reducing latency.
• USB connection: USB 3.0 ports and direct connections are faster than hubs and extensions.
• OS processing: background processes, drivers, and power-saving modes all add delay.
• Browser: different browsers handle and coalesce input events at different speeds.

Test Modes Explained

• Visual Lag: a trailing indicator follows your cursor — the gap between the two dots is an illustration of input lag, while the readout shows real event-processing delay.
• Event Timing: graphs the time between mouse-movement events. Lower, consistent values are better and reveal your effective polling rate.
• Click Latency: measures the processing time for each click and plots a histogram of the latencies you record.

Latency Benchmarks

Latency	Rating
< 2 ms	Professional gaming level
2–5 ms	Great for competitive play
5–10 ms	Acceptable for most users
10–20 ms	Noticeable lag in fast games
> 20 ms	May affect precision tasks

How to Reduce Mouse Latency

• Use a gaming mouse with a 1000 Hz or higher polling rate — confirm it with the Mouse Polling Rate Test.
• Connect directly to a USB port and avoid hubs, extenders, and front-panel headers.
• Update mouse drivers and firmware from the manufacturer.
• Close unnecessary background applications and browser tabs that compete for CPU time.
• Disable mouse acceleration in your OS settings for predictable movement.

Browser Limitations

Browser-based tests have inherent limitations compared with dedicated hardware measurement tools:

• They cannot read your actual hardware cursor position — latency is estimated from event timestamps.
• Chrome 60+ may coalesce multiple mouse events into one, which can artificially inflate readings.
• Results vary based on your browser, operating system, and overall system load.

Frequently Asked Questions

A mouse latency test measures the input lag between moving or clicking your mouse and the browser processing that event. This tool reports the event-processing delay in milliseconds across three modes — Visual Lag, Event Timing, and Click Latency — along with jitter, consistency, and your effective polling rate.

For browser-measured processing delay, under 2 ms is professional-gaming level, 2–5 ms is great for competitive play, and 5–10 ms is fine for most users. 10–20 ms becomes noticeable in fast games, and above 20 ms can affect precision tasks. Remember these are event-processing figures, not total system latency.

System load, browser activity, and background processes all affect latency. Each frame the browser has to schedule your input alongside everything else it is doing, so readings jump around. Close unnecessary programs and tabs and test again for the most stable numbers.

For gaming and precision work, yes — lower and more consistent latency feels more responsive. For everyday browsing and office work, anything under about 10 ms is imperceptible to most people, so chasing single-millisecond gains has diminishing returns.

Click and movement events are processed differently by the operating system and browser. Click events often pass through additional debounce handling, and they fire far less frequently than movement events, so their processing delay can read higher or lower than your cursor movement timing.

It measures browser-level event processing, not total system latency. Browsers cannot read your hardware cursor position directly — we estimate using event timestamps — and Chrome may coalesce multiple mouse events, which can inflate readings. For precise end-to-end measurements, dedicated hardware tools are required.

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