WHAT IS LATENCY?
Latency is response delay. It answers a different question from bandwidth or throughput.
DELAY, NOT BANDWIDTH
Latency is the time data takes to travel across a path and produce a response. Browser tests commonly report round-trip timing in milliseconds. A connection can have very high throughput and still feel sluggish in an interactive task when response delay is high.
WHAT ADDS LATENCY
Physical distance sets a real lower bound, while routing, Wi-Fi retransmissions, network queues, VPN paths and server processing can add more delay. The destination matters: a nearby test edge and a distant game server do not necessarily produce the same result.
Lower and stable latency is generally preferable for interactive traffic, but there is no single number that certifies every game, call or application.
IDLE AND LOADED LATENCY
Idle latency describes a relatively quiet path. Loaded latency observes response time while traffic is consuming capacity. If latency rises sharply only during heavy transfers, queueing or another load-related constraint becomes relevant evidence.
HOW TO TROUBLESHOOT
Repeat measurements, compare Ethernet with Wi-Fi, test with a VPN consistently on or off, and compare different times or destinations. Change one variable at a time. If only one service is slow while other paths remain responsive, investigate that service path rather than treating the local access link as proven faulty.
RUN LATENCY TEST→Reviewed for technical wording, measurement boundaries and links to the current 0bps toolset.
External references are provided for standards, definitions and deeper technical context. 0bps explanations remain independently written.