What an FPS mouse has to do well
Competitive FPS aim is mostly stop accuracy: arriving on target and stopping there. That rewards low mass, a sensor with no smoothing or acceleration, and a shell your fingers can brake against.
Secondary requirements are consistent click latency, reachable side buttons for utility, and a stable wireless link so no report is ever dropped mid-spray.
Tactical shooters: CS2 and Valorant
Both are low-sensitivity, crosshair-placement games with long counter-strafe flicks. A lightweight gaming mouse under 60 g with a flat-to-medium hump and a large, controlled pad is the standard setup.
Prioritise a 1 mm lift-off distance: on 30–45 cm/360 you reposition constantly, and a sensor that keeps tracking mid-lift will drift your aim.
Battle royales: Apex Legends and Fortnite
These are movement-heavy and tracking-heavy, played at higher sensitivity with lots of buttons bound. Comfort over a long match matters more than shaving the last three grams.
Look for firm side grips so the mouse does not slip while you are strafing and building, and for side buttons you can hit without regripping.
Pairing the mouse with a pad and settings
A control-surface pad slows the glide and helps stop accuracy; a speed pad favours long swipes and tracking. The mouse feet and pad behave as one system — changing either changes your aim.
Lock hardware DPI at 800, disable pointer acceleration, and set polling to 4000 Hz for ranked play if your CPU has headroom.