Question 1

What does this network latency test measure?

Accepted Answer

This test measures the round-trip time (RTT) between your browser and the server hosting this page. It sends 10 HTTP requests using fetch() with cache: "no-store" to prevent cached responses, measures elapsed time using performance.now(), and reports average, minimum, and maximum latency in milliseconds. The result includes DNS resolution, TCP connection, TLS handshake, and server response time combined.

Question 2

What is a good latency result?

Accepted Answer

Latency under 20ms is considered Excellent and typically indicates a fast connection to a nearby server. 20–50ms is Good and suitable for most online activities including gaming. 50–100ms is Fair and still acceptable for browsing and streaming, but may cause perceptible delay in real-time gaming. Over 100ms is Poor and can cause noticeable lag in latency-sensitive applications like competitive gaming or video calls.

Question 3

Why is this different from a ping test?

Accepted Answer

A traditional ping test uses ICMP packets at the network layer and measures pure network round-trip time. This browser-based test uses HTTP/HTTPS fetch requests, which are higher-level. The results will typically be higher than ICMP ping because they include TCP connection overhead, TLS handshake time, and browser processing. However, browser latency is more relevant for web application performance since web apps always use HTTP/HTTPS.

Question 4

Why does my latency vary between pings?

Accepted Answer

Latency variation (jitter) is normal and caused by several factors: network congestion, CPU scheduling delays, browser event loop delays, server-side processing variation, and garbage collection pauses in the JavaScript engine. High variation between pings is called jitter, and it is more problematic for real-time applications than consistently high latency. The min value represents your best-case network performance.

Question 5

Can I use this to test latency to other servers?

Accepted Answer

This specific test only measures latency to the server hosting this page because browser security policies (CORS) prevent arbitrary cross-origin requests from measuring timing accurately. To test latency to other servers like game servers or CDN endpoints, you would need a server-side tool or a network utility like ping, traceroute, or a dedicated speed test service.

Question 6

Does VPN or proxy affect the results?

Accepted Answer

Yes. A VPN routes your traffic through an additional server before reaching the destination, adding the latency to the VPN server plus the latency from the VPN server to the destination. If you are on a VPN and getting higher latency than expected, try disconnecting and retesting. VPNs with nearby servers can sometimes improve latency if your ISP routes traffic suboptimally.

Network Latency Test

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