Some top-tier gaming mice report a dip in effective DPI when the cursor is moved very slowly.
A popular peripheral reviewer found that mice using PixArt PAW3395, PAW3950 and PAW3399 sensors all apply a "DPI downshift" at low velocity. The firmware throttles the reported DPI to curb jitter, but the trade‑off is a 2‑5% reduction for most models and up to 8‑10% for the Razer Viper V4 Pro. Three downshift behaviours were identified: a binary cut‑off at around 7,500 DPI, a profile‑switch that affects most settings, and a subtle shift that operates at every DPI level.
The issue matters because competitive shooters rely on precise micro‑adjustments. A sudden 10% slowdown can throw off aim in games like Counter‑Strike, especially for players who favor high DPI settings. The problem also shows that newer custom sensors are not immune, challenging the assumption that newer = better.
Manufacturers can mitigate the bug with a firmware fix, but until then users may opt to stay below the 7,500 DPI threshold where the most aggressive downshift triggers. For most casual gamers the impact will be negligible, but pro‑level players should test their mouse at low speeds before committing to a high‑DPI setup.