Measure ping (latency) to see how responsive your connection is — crucial for gaming and video calls.
Under 20ms is excellent, 20–50ms is good for gaming and calls, 50–100ms is playable for most games, and over 150ms starts to feel noticeably laggy.
Distance to the server, Wi-Fi interference, network congestion, and VPNs can all increase ping. A wired connection usually gives the lowest, most stable ping.