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Web Latency Tester

A browser-based latency tester that measures real-world response times to major global CDNs and services including Cloudflare, Fastly, AWS S3, GitHub, and Vercel. Perfect for developers diagnosing slow site performance, network engineers benchmarking CDN providers, or anyone wondering if their internet is slow or if it's just that specific website. Unlike traditional ping tools that require command-line access, this tool runs entirely in your browser and shows you exactly what your users experience when accessing different services. Use Latency Test when you need answers fast during debugging, reviews, or incident triage. Paste your input, validate the output, then copy results into tickets or docs in seconds. Most processing runs in your browser, so you can test safely without unnecessary data exposure. Method details for Latency Test: Analysis surfaces concrete network signals including dns, latency, bandwidth, packet, port, subnet, and throughput, with explicit ipv4/ipv6 handling.

How to Use This Tool

  1. Select Endpoints - Choose which CDNs and services you want to test (default: all selected)
  2. Click Test Latency - The tool sends lightweight HTTP HEAD requests to each endpoint
  3. Review Results - See response times with visual bars, plus fastest, slowest, and average latency statistics

Why This Method?

Traditional ping commands use ICMP packets that many servers block for security reasons. This tool uses HTTP HEAD requests via the Fetch API with performance.now() timing to measure actual application-layer latency, which is what your browser experiences when loading web pages. This provides a more accurate picture of real-world performance than ICMP ping.

Latency (measured in milliseconds) represents the round-trip time for data to travel from your device to the server and back. Values under 50ms are excellent, 50-100ms is good, 100-200ms is acceptable, and anything above 200ms may cause noticeable delays. CDNs like Cloudflare and Fastly typically show lower latency because they use edge networks to serve content from geographically closer servers.

By testing multiple services simultaneously, you can determine whether slow performance is due to your internet connection (all services slow), your ISP's routing (specific CDN slow), or the target website itself. This is invaluable for developers choosing hosting providers or debugging why users in certain regions report slow performance.