Mouse event queue size
On this page
Recommendation
Leave as defaultLeave the default value — 100 events.
A smaller queue does not reduce input latency and increases the risk of losing events under load. Increase it only after confirmed overflow errors and after checking the USB, driver and power of the device.
- Default value
- 100 events
- FPS and memory
- FPS is not affected
What changes
Section titled “What changes”The mouse class driver works like the keyboard driver: events accumulate in a queue, and the parameter sets how many mouse events can wait to be processed. The default and BoosterX-recommended value is 100 events.
The general buffer mechanism, event loss on overflow and the relation to input latency are covered in the article «Keyboard event queue size». Mouse-specific: an enlarged buffer helps with unstable USB power and a very high polling rate, when events arrive faster than the driver can pick them up (according to the visible BoosterX description).
Exceptions and differences
Section titled “Exceptions and differences”Why the tweak is in «Legacy»: the same as with the keyboard — the size is changed only on confirmed overflows, it is not a latency optimization. According to the visible BoosterX description, reducing the buffer supposedly «reduces lag» only in internet theories: in practice it leads to overflow errors in the system log, cursor teleports and freezes.
How to verify the result
Section titled “How to verify the result”After the change and a reboot, check fast movements, a high polling rate and holding buttons. Look for overflow warnings in the system log of «Event Viewer» (according to the visible BoosterX description — mouse driver buffer overflow errors). Without a measurable difference, it is safer to return the default value.
How to change and revert
Section titled “How to change and revert”In BoosterX, open «Optimization» → «Legacy» → «MouseDataQueueSize» (the item in the application list is named by the key without translation), set the value and click «Apply». If «Instant apply» is enabled, a separate click is not required. Reboot the PC and check the mouse behavior.
Confirmation
Section titled “Confirmation”- Microsoft: Configuration of Keyboard and Mouse Class Drivers, checked 2026-09-19 — the mouse class driver event buffer in non-paged memory.
- Keyboard event queue size — the general input buffer mechanism.
Last check: 2026-09-20.