Some top gaming mice drop DPI when moved very slowly

A YouTuber, pandahling, says some leading gaming mice that use PixArt PAW3395, PAW3950, and PAW3399 sensors reduce their effective DPI when moved at very low speeds. The firmware feature—intended to prevent stationary cursor jitter—appears to throttle higher DPIs down to a lower setting when velocity is very low, which can make deliberate tiny movements register more slowly than expected.

Pandahling outlines three DPI-downshift behaviours: a binary downshift that kicks in above a threshold (usually 7,500 DPI); a profile-switch variant that subjects most DPI settings to downshift at low velocities; and a subtle downshift that seems to affect every DPI setting, including lower ones.

He found this third type in all four PAW3950 mice he bought and in the Viper V4 Pro, which uses a newer custom PixArt sensor. Tests recorded a 2–5% DPI reduction for the mice sampled, while the Viper V4 Pro showed an 8–10% drop, but only at very low velocities.

gaming mice, dpi, pixart, paw3395, paw3950, paw3399, pandahling, viper v4, firmware downshift, cursor jitter