Mouse Polling Rate and DPI: What They Mean

Polling rate: reports per second

A mouse sends position updates to the computer at intervals. Polling rate describes how many updates it aims to send in one second, measured in hertz. At 125 Hz, an update arrives roughly every eight milliseconds. At 1,000 Hz, it is roughly every one millisecond.

A higher rate can make cursor movement feel more immediate, particularly on a high-refresh-rate screen. It is not a promise that every update will arrive at exactly the same time. Browser workload, the operating system, wireless conditions and the way a test receives pointer events can all affect a live reading.

DPI: pointer sensitivity

DPI stands for dots per inch, although mouse settings may call it sensitivity or use a different label. In practical terms, a higher DPI makes the cursor travel farther when you move the mouse by the same distance. It changes distance, not how often the mouse reports.

There is no single correct DPI. A setting that feels calm on a small laptop display may feel slow across a large high-resolution screen. Your application can add its own sensitivity setting as well, so a mouse setting that suits desktop work may not suit a game or drawing tool.

How the two settings work together

Think of DPI as the size of each movement and polling rate as the frequency of the updates. Raising DPI alone may make the cursor faster but not more frequent. Raising polling rate alone may make movement updates more frequent but does not change the cursor distance.

For everyday use, consistency matters more than a large number. Pick a comfortable sensitivity, then give yourself time to adapt before changing it again. If a mouse has a physical DPI button, be aware that it can be pressed by accident and may explain a sudden change in feel.

Checking a mouse in the browser

1. Use a wired connection first if possible. This removes a low battery or radio link from the first check.
2. Move in smooth circles and straight lines. The polling rate test gives a current estimate while you move.
3. Compare more than one port or computer. A difference can point to a connection or system setting rather than the mouse.
4. Test clicks separately. The double-click test can reveal unusually close repeated click signals, often called switch bounce.

When the number looks lower than expected

A browser result is a useful observation, not a certification of a mouse’s specification. Move at a natural continuous speed for several seconds. A very slow movement, a busy browser or a screen that is conserving power can make the estimate jump around. Check whether the mouse software has a selectable polling-rate setting, then retest after changing it.

If movement cuts out rather than merely looking less smooth, charge or replace the battery where appropriate, check the cable for strain and try a different port. Do not open the mouse unless you accept the risk of damage or loss of warranty coverage.

Frequently asked questions