How to Measure and Reduce Input Lag on Windows
Measure sub-millisecond reaction times and analyze the complete Click-to-Photon latency breakdown across monitor refresh rate, mouse polling, and Windows 0.5ms kernel timer.
0.5ms Input Lag & Reaction Benchmark
Test your raw visual reaction time, and examine the complete end-to-end Click-to-Photon latency stack to see how OS kernel tuning shaves off machine latency.
Click-to-Photon Latency Stack Breakdown
See where latency accumulates across your monitor, mouse polling, Windows kernel timer, and GPU render queue.
How to Measure and Reduce Input Lag on Windows
Arm the Arena
Click the reaction arena to initiate random interrupt delay.
Click on Green
React as fast as possible when the arena turns Cyber Emerald.
Inspect the Latency Stack
Simulate monitor Hz, mouse polling, and 0.5ms timer resolution to see total machine latency.
Frequently Asked Technical Questions
What is Click-to-Photon latency?
Click-to-Photon latency is the total elapsed time between physical mouse microswitch actuation and the corresponding visual change on monitor pixels.
How does 0.500ms Timer Resolution reduce latency?
Windows defaults to a 15.625ms timer slice, delaying thread sleep wakeups. Locking 0.500ms forces the kernel to process input interrupts up to 31 times faster.