240Hz Monitor and Low-Latency Mouse: A Programmer's Precise Measurement
2025-07-06
A programmer, highly sensitive to latency, found a significant improvement after upgrading to a 240Hz monitor. However, switching USB ports for his wireless mouse introduced delays of around 10ms every few seconds. To precisely measure this, he developed a tool, found.as/l, that displays the delay between browser-rendered frames and pointer movements, along with pointer event batching and offsets. He also had to modify his xmit.toml to add CORS headers for high-precision timers. His observations were confirmed, leading him to avoid the problematic USB port.
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