How to Reduce Input Lag in PC Games

The biggest reductions in PC input lag come from five changes, roughly in this order: raise and cap the frame rate, switch off V-Sync where the setup allows it, turn on the game's low-latency mode, use a wired mouse and a high-refresh display, and close background programs. Each change removes a delay from a different stage between pressing a button and seeing the result on screen.

This guide explains where the delay comes from, gives the frame-time math, and sets out a testing method so you can see which change helped on your own machine.

Where input lag comes from

Input lag is the time from an action, such as a mouse click, to the matching change on the display. It is the sum of several delays:

1. The input device: polling, wired or wireless connection.
2. The game: reading input, running the simulation, and preparing a frame.
3. The graphics driver and GPU: queuing and rendering frames.
4. The display pipeline: V-Sync, buffering and scan-out.
5. The monitor: processing, pixel response and refresh.

Improving any one stage helps, though the largest delays are usually in the middle, where frames wait in queues.

Frame time math

Every frame takes a fixed amount of time to draw, and a higher frame rate shortens it:

Time per frame is 1000 divided by the frame rate. Going from 60 to 144 fps cuts the per-frame wait by about 9.7 ms, and that saving applies at several points in the pipeline, so the real reduction is often larger. The gain from 240 to 360 fps is only about 1.4 ms per frame, which explains why returns shrink at very high rates.

Raising the frame rate also helps on a 60 Hz monitor, because newer frames are available when the display refreshes. It is one reason competitive players run frame rates well above their refresh rate.

Step 1: raise the frame rate, then cap it

Lower graphics settings that cost frames without changing gameplay: shadows, reflections, volumetric effects and heavy anti-aliasing. Check the in-game benchmark or an overlay to see the average and the lowest frame rates.

Then set a frame cap. An uncapped game that maxes out the GPU builds a queue of frames, and the queue adds delay. A cap a few frames below the monitor's refresh rate, for example 141 fps on a 144 Hz display with variable refresh, keeps the GPU from saturating and the queue short. Use the game's own limiter if it has one, or the graphics driver's limiter.

Step 2: V-Sync & variable refresh

Traditional V-Sync waits for the display's refresh before showing a frame, which adds buffering and delay. Switching it off gives lower lag, at the cost of screen tearing.

A better combination for many setups is variable refresh rate (called G-Sync or FreeSync on supported monitors) plus a frame cap just under the refresh rate. This prevents tearing without the full V-Sync delay. If you use V-Sync because tearing bothers you, this is the first alternative to try.

Step 3: low-latency modes

Graphics drivers and some games offer settings that reduce the render queue. NVIDIA calls its feature Reflex, and AMD offers Anti-Lag. Where a game supports one, turning it on usually reduces latency, particularly when the GPU is the limit. The effect is smaller if the processor is the bottleneck or the frame rate is already capped well below what the GPU can render.

Test with the setting on and off. Some titles show a latency readout in the options menu, which makes comparison easy.

Step 4: display mode

Exclusive fullscreen used to be best for latency, but modern borderless modes using a flip presentation model can match it. Try both: check whether the game offers fullscreen, and compare the feel and any latency readout. Avoid windowed mode with a desktop compositor if lag matters, because it can add a frame.

Turn off any overlays you do not need, such as screen recorders or chat overlays, since they can add processing to every frame.

Step 5: the mouse, keyboard & controller

Wired devices avoid wireless delays, and a polling rate of 1000 Hz means the device reports every millisecond. Higher polling rates, such as 4000 Hz or 8000 Hz, give smaller gains and use more processor time, so test before committing.

Mouse settings also affect aim. If you are adjusting your mouse, the guide to mouse sensitivity in cm per 360 covers how to choose a sensitivity once the input path is fast. For controllers, the way the stick is read matters as much as the cable, a topic in controller deadzone settings explained.

Step 6: the monitor & the network

Choose the display's fastest refresh rate in the operating system's display settings. Many monitors ship at 60 Hz until you change it. Check the monitor's menu for a game mode and for overdrive settings: a moderate overdrive reduces blur without adding artifacts, and settings that add image processing, such as sharpening, can add delay.

On a television, switch on game mode, which turns off processing that adds many milliseconds.

For online play, network delay (ping) is separate from input lag, though it matters too. A wired connection beats Wi-Fi for stability, and weak rooms can be improved by following the Wi-Fi router placement guide.

Step 7: close what you do not need

Background programs compete for processor time and can cause frame time spikes, which feel like sudden lag. Close browsers with many tabs, video players and update tools before gaming. Check the operating system's game mode setting, and keep graphics drivers up to date.

If the machine overheats, it will slow itself down. Clean dust from fans and filters, and keep vents clear.

How to test your changes

Perception is unreliable, so measure where you can:

1. Use an in-game latency readout if one exists.
2. Record results from one repeatable scene, such as a practice range.
3. Change one setting at a time.
4. Compare average frame rate and the lowest 1% of frames, since stutter feels like lag.
5. If you have a phone with a high-speed camera mode, film a click and the muzzle flash on screen and count frames.

Keep notes in a table so you can see which change gave the biggest improvement.

A priority order

If you only have ten minutes, do these in order:

1. Set the monitor to its highest refresh rate.
2. Cap the frame rate just below the refresh rate.
3. Turn on the game's low-latency mode.
4. Disable V-Sync if you can tolerate tearing, or use variable refresh.
5. Close background programs.

FAQ

Does a higher refresh rate reduce input lag?

Yes. A faster refresh shows new frames sooner and shortens the wait between a frame being ready and displayed. The effect is largest when your frame rate can match the refresh rate.

Is V-Sync always bad for latency?

V-Sync adds delay, but it prevents tearing. If you play for enjoyment and tearing bothers you, variable refresh with a frame cap gives a better balance than classic V-Sync.

Do I need a gaming mouse?

Not necessarily. A wired mouse with a stable 1000 Hz polling rate and a good sensor is enough for most people. Features beyond that matter less than consistency.

Does wired or wireless matter?

Modern wireless gaming devices can be very close to wired ones, but cheap or congested wireless connections can add delay. A wire removes the question.

What to do first

Check your monitor's refresh rate setting, then cap your frame rate. Those two changes cost nothing and often make the biggest difference. After that, test the low-latency mode and V-Sync options on one game, and record what you find before changing more.