Input Lag Test
Measure your browser response latency in milliseconds. Click the target, get your results. No download needed.
What Is Input Lag?
Input lag is the delay between your physical action (like clicking a mouse button) and the response appearing on screen. In gaming this delay can mean the difference between hitting a shot and missing it. This tool measures your browser rendering latency, which is one component of total system input lag.
How to Use the Input Lag Test
Click Start Test
Click the target as soon as you see it appear
Complete all 5 rounds
See your average browser response latency
Input Lag Benchmarks
| Input Lag | Rating | Impact on Gaming |
|---|---|---|
| Under 5ms | Excellent | No noticeable impact |
| 5-10ms | Good | Minimal impact |
| 10-20ms | Average | Slight delay in fast games |
| 20-35ms | Below average | Noticeable in FPS games |
| 35ms+ | High | Clear delay, affects aim |
What Causes Input Lag?
Total input lag comes from multiple sources: mouse polling rate (1000Hz mouse = 1ms), USB processing, game engine frame time, GPU render time, monitor response time, and monitor refresh delay. This browser test measures JS event and render latency only. For complete input lag testing you need specialized hardware.
How to Reduce Input Lag
- ▸Use a 1000Hz polling rate mouse
- ▸Enable game mode on your monitor
- ▸Use DisplayPort instead of HDMI where possible
- ▸Turn off VSync (adds 1-2 frame delay)
- ▸Close background apps and browser tabs
- ▸Use a wired mouse instead of wireless
- ▸Set your monitor to its maximum refresh rate
Frequently Asked Questions
What is good input lag for gaming?
Under 10ms browser latency is excellent. Total system input lag under 20ms is considered good for competitive gaming. Professional setups aim for under 10ms total.
Does input lag affect FPS games?
Yes significantly. In fast-paced FPS games even 20ms of extra input lag can cause you to miss shots that should have connected. This is why competitive players invest in high refresh rate monitors and low latency peripherals.
How is browser input lag different from monitor input lag?
Browser input lag measures how quickly JavaScript and the browser rendering pipeline respond to your click. Monitor input lag measures how quickly pixels change after receiving a signal. Both contribute to total perceived lag.