Input lag is the time delay between a physical action, such as clicking your mouse or pressing a key, and the resulting visual feedback on your monitor. In competitive titles like CS2, Valorant, Fortnite, and Apex Legends, high input lag makes your aim feel sluggish and disconnected from your hand movements.
Reducing system latency requires optimizing every link in your rendering pipeline. Here is how to reduce input lag in gaming across your operating system, graphics drivers, and peripheral hardware.
Understand the three stages of system latency
Total system latency consists of three distinct stages:
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Peripheral latency: The time required for your mouse switch or keyboard PCB to register an input and transmit the USB packet to your motherboard.
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PC latency: The time your CPU takes to process game logic, pass the draw calls to the render queue, and have your GPU render the frame.
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Display latency: The time your monitor takes to process the incoming display signal, scan out the scanlines, and transition its LCD or OLED subpixels.
Optimize your mouse polling rate and USB controller power
Your mouse polling rate dictates how frequently your peripheral reports position data to Windows. While 1000 Hz delivers a 1 millisecond reporting interval, modern gaming mice support 2000 Hz, 4000 Hz, or 8000 Hz. If your CPU has sufficient multi-core power, switching to 2000 Hz or 4000 Hz reduces input packet delivery delay.
Furthermore, Windows USB root hubs frequently enter low-power sleep states to save power, introducing random input latency spikes. To disable USB power management:
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Right-click the Start button and select Device Manager.
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Expand the Universal Serial Bus controllers category.
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Right-click each USB Root Hub and select Properties.
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Switch to the Power Management tab.
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Uncheck Allow the computer to turn off this device to save power and click OK.
Test your system input delay in real time
You can test your estimated input latency and peripheral response profile directly:
Input Delay Check
What's your mouse polling rate?
USB polling rate directly determines your minimum input lag. Higher = faster response.
Enable NVIDIA Reflex or AMD Anti-Lag in game engines
When your graphics card runs at 99% usage, your CPU queues up pre-rendered frames. While this keeps average frame rates high, it introduces severe render queue delay (often 20 to 40 milliseconds). Low latency technologies solve this by dynamically synchronizing CPU work with GPU render readiness.
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In titles supporting NVIDIA Reflex, set the in-game option to On + Boost. The Boost mode prevents GPU core clocks from dropping in CPU-limited situations.
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For AMD systems, enable AMD Anti-Lag or Anti-Lag 2 in supported titles to align CPU frame generation timing.
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In games without native Reflex support, configure our recommended NVIDIA Control Panel latency settings by setting Low Latency Mode to Ultra.
| Setting | Recommended Value | Why |
|---|---|---|
| NVIDIA Reflex / AMD Anti-Lag | On + Boost | Eliminates the GPU render queue buffer during heavy scenes. |
| Low Latency Mode (Driver) | Ultra | Limits pre-rendered frames to zero when Reflex is absent. |
| Windows Game Mode | On | Prioritizes foreground game threads over background DWM tasks. |
| Display Refresh Rate | Highest Native Hz (e.g. 240Hz/360Hz) | Reduces frame scan-out interval from 16.6ms (60Hz) to 4.1ms (240Hz). |
| Monitor Overdrive | Fast / Normal (No Overshoot) | Shortens pixel rise/fall response times without inverse ghosting. |
Configure G-Sync and FreeSync without input lag penalties
A common misconception is that variable refresh rate (VRR) technologies add noticeable input lag. When configured correctly, G-Sync and FreeSync eliminate screen tearing with virtually zero latency penalty.
To set up tear-free, low-latency VRR:
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Enable G-Sync / FreeSync in your GPU control panel.
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Turn V-Sync to ON in your GPU control panel (never in-game). This enforces frame pacing within the display refresh range.
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Cap your in-game frame rate 3 to 4 FPS below your monitor refresh rate (e.g., cap at 237 FPS on a 240 Hz panel). This prevents your system from hitting the hardware V-Sync buffer ceiling.
For more hardware configurations and system interrupt tuning, check our complete gaming PC low latency guide.
Disable full screen optimizations for legacy titles
Windows Desktop Window Manager (DWM) can sometimes force triple buffering on older DirectX 9 and DirectX 11 titles running in windowed modes. For older games that feel floaty:
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Right-click your game executable (.exe) and select Properties.
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Switch to the Compatibility tab.
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Check Disable fullscreen optimizations and click Apply.
Automate system latency tuning with FPS Tweak
Manually adjusting timer resolutions, kernel thread priorities, and DPC interrupt routing is tedious and risky. Applying a tested fps tweak optimizer configures your system timer to high precision (0.5ms resolution) and isolates gaming processes from Windows background interference. Competitive players looking for consistent 1ms peripheral handling can use FPS Tweak Premium for automatic system latency optimization.
If you also want to increase your average frame rates alongside lower input lag, read our tutorial on how to boost FPS on PC.