Input Lag Test
Test your monitor's input lag and response time. Essential for competitive gaming, PS5, Xbox, and FPS games. Measure display latency instantly - no download required.
Reaction Time & Input Lag Test
Click the green circles as fast as you can when they appear. Your reaction time helps estimate perceived input lag.
Click "Start Test" to begin
Click the green targets as quickly as possible when they appear
Average
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Best
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Rating
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Understanding Your Results
What is Input Lag?
Input lag (also called display lag or latency) is the total delay between when you press a button or move your mouse and when the corresponding action appears on your screen. For gamers, especially in competitive titles, minimizing input lag is crucial for responsive gameplay.
Signal Processing
Time for monitor to process incoming video signal. Varies by display technology and settings.
1-15ms typical
Pixel Response
Time for pixels to change color. Affects motion clarity and ghosting.
1-5ms (GTG)
Refresh Cycle
How often the display updates. Higher refresh = lower latency.
16.67ms @60Hz / 8.33ms @120Hz
Input Lag vs Response Time
These terms are often confused, but they measure different things:
| Metric | What It Measures | Good Value |
|---|---|---|
| Input Lag | Total delay from input to display | <10ms |
| Response Time (GTG) | Pixel color transition speed | <5ms |
| Refresh Rate | Screen updates per second | 120Hz+ |
Input Lag for PS5 Gaming
PS5 Input Lag Requirements
For optimal PS5 gaming, your monitor's input lag is critical. The PS5 supports up to 4K@120Hz, which inherently reduces latency compared to 60Hz displays.
- Enable Game Mode on your monitor
- Use HDMI 2.1 for 4K@120Hz
- Enable ALLM (Auto Low Latency Mode)
- Disable motion smoothing/interpolation
Recommended PS5 Monitor Input Lag
How to Reduce Input Lag
Monitor Settings
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1
Enable Game Mode
Disables image processing that adds latency
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2
Use Native Refresh Rate
Match your output to monitor's native refresh
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3
Disable Motion Smoothing
Frame interpolation adds significant lag
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4
Use Fastest Overdrive
Reduces pixel response time (watch for overshoot)
Connection & Hardware
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1
Use DisplayPort or HDMI 2.1
Higher bandwidth = faster signal transmission
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2
Enable VRR/G-Sync/FreeSync
Eliminates tearing without adding lag
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3
Use Wired Peripherals
Wireless adds 1-10ms latency
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4
Update Firmware
Manufacturers often improve input lag via updates
Input Lag by Refresh Rate
Higher refresh rates directly reduce input lag because frames are displayed more frequently. Here's the minimum theoretical frame time at each refresh rate:
| Refresh Rate | Frame Time | Typical Total Input Lag | Best For |
|---|---|---|---|
| 60Hz | 16.67ms | 20-35ms | Casual gaming, video |
| 120Hz | 8.33ms | 8-15ms | PS5, Xbox Series X |
| 144Hz | 6.94ms | 6-12ms | Competitive gaming |
| 240Hz | 4.17ms | 3-8ms | Esports, pro gaming |
| 360Hz | 2.78ms | 2-5ms | Professional esports |
Frequently Asked Questions
What is input lag?
Input lag is the delay between when you press a button or move your mouse and when the action appears on screen. It's measured in milliseconds (ms) and includes display processing time, signal transmission, and pixel response.
What is good input lag for gaming?
For gaming, input lag under 10ms is excellent. Competitive FPS gamers should aim for under 5ms. Casual gaming is comfortable up to 20ms. Anything over 30ms becomes noticeable and can affect gameplay.
How do I reduce input lag on my monitor?
Enable Game Mode in your monitor settings, use the native refresh rate, connect via DisplayPort or HDMI 2.1, disable unnecessary image processing like motion smoothing, and ensure VRR is enabled if supported.
Does 120Hz reduce input lag?
Yes, higher refresh rates reduce input lag. At 60Hz, each frame takes 16.67ms. At 120Hz, frames display every 8.33ms, and at 240Hz every 4.17ms. This directly reduces the delay between input and display.
What input lag do I need for PS5?
For PS5 gaming, aim for input lag under 10ms at 4K@120Hz. Most HDMI 2.1 gaming monitors achieve 4-8ms. Enable Game Mode and ALLM (Auto Low Latency Mode) for optimal performance.
Related Testing Tools
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Recommended Low Input Lag Gaming Monitors
ASUS ROG Swift PG27AQN (360Hz, 1ms)
Ultra-low input lag for competitive gaming - Price: $700-900
View on AmazonLG 27GP950-B (4K 144Hz, HDMI 2.1)
Best for PS5 gaming with 4.2ms input lag - Price: $650-750
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