Measure round-trip latency to endpoints using fetch timing API. Graph latency over time and compute statistics.
Network Latency Tester sends fetch requests from the current browser to selected endpoints, records the elapsed time for each attempt, plots the samples over time, and summarizes the recorded timings statistically. The result reflects the path and conditions experienced by that browser. The common surprise is that this is not an ICMP ping. A fetch measurement can be affected by HTTP handling, server response time, redirects, connection reuse, caching, and browser scheduling, so it should be read as web-request latency rather than pure network transit time.
Each sample comes from a browser fetch attempt to an endpoint. Its elapsed duration can include work beyond packet travel, such as establishing or reusing a connection and waiting for the endpoint to respond. Repeating the measurement exposes variation that a single request would hide. Failed or browser-blocked requests do not provide a valid latency sample.
Successive measurements form the latency graph, preserving when fast responses, slow responses, and spikes occurred. The statistics summarize the collected values, while the graph shows their distribution through time. A stable summary can still conceal an isolated spike, and a short run may not represent conditions during another period, network route, or device state.
No. The browser's security model still applies. A different-origin endpoint may need to permit the page's origin through CORS, and an HTTPS page generally cannot fetch an HTTP target because that is active mixed content. A failed test can therefore indicate browser policy or endpoint configuration rather than an unreachable host.
No. Command-line ping commonly measures ICMP echo traffic, while this tool observes a browser fetch. The fetch result is useful for judging latency experienced by web requests, but it does not isolate network-only round-trip time. A server can answer ICMP quickly yet handle HTTP slowly, or it can block ICMP while remaining available over HTTPS.
The behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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