Analyseur d'Input Lag et Temps de Réaction

Input lag is the total delay from pressing a mouse button or touching a screen to the resulting visual change appearing on display pixels. Click-to-photon latency includes peripheral delay, OS processing, GPU render time, and panel refresh scan-out.

Higher refresh rates reduce frame presentation delay (60Hz = 16.67ms per frame, 240Hz = 4.17ms per frame, 540Hz = 1.85ms per frame). Moving from 60Hz to 240Hz saves up to 12.5ms of visual latency.

Mouse polling rate is how frequently your mouse reports position updates to the OS. A 1000Hz mouse updates every 1.0ms, while an 8000Hz mouse updates every 0.125ms, reducing micro-stutter and input delay.

The average human visual reaction time is approximately 200ms–250ms. Trained esports athletes achieve reaction times between 140ms and 170ms.

W3C High-Resolution Time (performance.now()) provides microsecond-precision hardware timestamps (accurate to 0.005ms), eliminating standard JavaScript date timing jitter.

Wireless Bluetooth protocol overhead, packet queuing, and power-saving sleep states add 7ms–15ms of extra input latency compared to wired USB HID or 2.4GHz high-speed wireless dongles.

Standard V-Sync forces the GPU to wait for the monitor's vertical refresh interval, adding up to 1–2 full frames of input delay (16ms–33ms at 60Hz). Use G-Sync/FreeSync or NVIDIA Reflex/AMD Anti-Lag to eliminate VSync buffering delay.

Browsers process pointer events on the main UI thread. High CPU usage or complex JavaScript event listeners can delay event dispatch by several milliseconds.

Use a high refresh rate monitor (144Hz+), a wired 1000Hz+ mouse or fast touch digitizer, close background applications, and focus on the reaction zone.

Refresh the page or press the 'R' key to clear recorded reaction times, best scores, and the reaction histogram.