How to Fix Input Lag on a Gaming PC

Quick Answer

Input lag on a gaming PC comes from the chain of display, settings and peripherals - not usually the PC's raw speed. The biggest wins are turning on the monitor's gaming mode, disabling V-Sync in favour of a frame cap, and using a high-refresh monitor (144Hz+) and a high-polling-rate mouse (1000Hz+). A 144Hz monitor at Evetech starts around R3,500.

Fix The Display First

Your monitor adds latency. Switch it to Game Mode or low-latency mode in the OSD, which disables image-processing that delays frames. A 144Hz panel shows a new frame every 6.9ms versus 16.7ms on a 60Hz screen, so high refresh is the single biggest input-lag reduction. Enable a low-latency feature like Nvidia Reflex in supported games.

V-Sync, Frame Caps And Settings

V-Sync adds noticeable lag. Instead, cap your frame rate a few FPS below your refresh rate (e.g. 141fps on a 144Hz panel) and use G-Sync or FreeSync for tear-free, low-latency output. Keep settings high enough to stay above your refresh rate, since dipping below it raises perceived lag.

Peripherals And USB

A 1000Hz polling-rate mouse reports position every 1ms versus 8ms on a basic 125Hz mouse. Use a wired connection or a low-latency wireless gaming mouse, and plug peripherals into rear motherboard USB ports rather than a hub for the cleanest signal.

FAQ

What causes input lag on a gaming PC?

Mostly the display and settings - a 60Hz monitor, V-Sync on, and a slow mouse. A 144Hz panel, a frame cap with FreeSync, and a 1000Hz mouse cut it sharply.

Does V-Sync add input lag?

Yes, noticeably. Disable it and instead cap frames just below your refresh rate while using G-Sync or FreeSync for tear-free output with far lower latency.

Does mouse polling rate affect input lag?

Yes. A 1000Hz mouse reports every 1ms versus 8ms on a 125Hz mouse. Use a wired or low-latency wireless gaming mouse for the most responsive feel.