延迟
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定义
数据包从源端发出到目的端接收之间的时间间隔，通常以毫秒（ms）为单位。
解释
Transatlantic fiber latency is roughly 70–80 ms due to the physical speed of light in glass (~200,000 km/s). Satellite internet adds ~600 ms for geostationary orbits, making real-time gaming impractical. For interactive applications, latency below 20 ms feels instantaneous; above 150 ms, users notice delays. Latency is distinct from bandwidth: a high-bandwidth pipe can still have high latency.
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