Press the highlighted key as fast as you can to measure your keyboard's response time and input lag down to the millisecond. Get precise readings of your key-to-screen latency, average response time, and consistency scores — essential for competitive gaming, fast typing, and keyboard performance benchmarking.
This test measures your keyboard's input lag - how fast your keyboard registers and reports key presses to your computer. Press any key to instantly measure the input response time in milliseconds.
How it works: Each key press is measured from the moment you press it to when the system receives the input. Lower numbers indicate better keyboard performance.
Each key press instantly measures your keyboard's input lag
Complete some tests to see your performance analysis.
Keyboard input lag is the time between pressing a key and the system registering the event. While often confused with human reaction time, input lag is a hardware and system-level measurement — typically between 1ms and 15ms depending on your keyboard type. For a full key-by-key diagnostic, try our keyboard tester to check every key on your keyboard.
1–3ms input lag. The gold standard for gaming and fast typing. Direct USB polling with no signal conversion.
3–8ms input lag. Adequate for general use and office work but not ideal for competitive gaming.
5–15ms input lag. Modern 2.4GHz wireless keyboards are competitive, but Bluetooth adds noticeable latency.
A direct USB connection eliminates wireless transmission latency. Even modern wireless keyboards can't fully match a wired mechanical keyboard for raw response time.
Higher polling rates (500Hz or 1000Hz) mean the keyboard reports its state more frequently, reducing the window for input lag. Check your keyboard's USB polling rate settings.
Avoid USB hubs, especially unpowered ones. Plug your keyboard directly into a motherboard USB port for the most reliable and fastest signal path.
CPU-heavy background processes can add software-level input latency. Close unnecessary applications when testing or gaming to get the most accurate and lowest latency readings.
Under 2ms is excellent and typical of high-end wired mechanical keyboards. Under 5ms is good for everyday use. Over 8ms may be noticeable in fast-paced gaming.
For most users, input lag under 10ms is imperceptible during normal typing. However, competitive gamers and fast typists (90+ WPM) may notice inconsistencies above 5ms.
Wireless keyboards add transmission time over Bluetooth or RF. Bluetooth typically adds 10–30ms while 2.4GHz dongles are much faster (1–5ms). Battery level can also affect wireless performance.
Browser-based tests measure the full pipeline from key event to JavaScript handler. Results include OS-level and browser processing overhead (typically 1–3ms), so readings reflect real-world performance rather than raw hardware specs.