Methods.

A complete explanation of how a browser can measure mouse polling rate up to 8 kHz: coalesced pointer events, hardware timestamps, interval distributions, and what the browser cannot see.

Why most CPS test sites get peak click rate wrong, and How DeviceCheckOnline computes the rolling 1-second maximum that matches what game-server anti-cheat actually measures.

The honest browser-based DPI test: comparing cursor pixel-travel to physical ruler distance with devicePixelRatio correction, and what disables enhanced pointer precision actually changes.

The five-character word convention, accuracy weighting, consistency math, and why your WPM here may differ from 10fastfingers or Monkeytype.

Why rAF-based measurement is the gold-standard browser method, what it misses (VRR, fullscreen-exclusive), and how we classify 60/120/144/240/360 Hz panels.

K-weighting, momentary vs short-term vs integrated, and exactly which BS.1770 / R128 specifications our meter implements.