Speed Test
Measure your current connection latency, jitter and throughput against a Cloudflare-scale edge. No browser plugins, no tracking.
About the speed test
Measures your current connection to Cloudflare's edge: round-trip latency, jitter, download throughput and upload throughput. Runs entirely via fetch() in your browser - no Flash, no browser extension.
Each run performs a warm-up, ten latency probes for RTT + jitter, three parallel 10 MB downloads for throughput, and three parallel 4 MB uploads.
Interpreting the numbers
- RTT - time for a tiny request to reach the edge and back. Below 30 ms feels instant; above 100 ms is noticeable for interactive work.
- Jitter - variability of RTT. High jitter hurts VoIP and gaming more than it hurts browsing.
- Download - throughput for a few large parallel transfers. Most home connections peak below the advertised number because of TCP overhead and WiFi.
- Upload - critical for video calls, backup and file sharing. Often much lower than download on asymmetric connections.
Questions
Why is my result lower than speedtest.net?
Browser-based tests are capped by single-connection TCP throughput. speedtest.net uses many parallel connections for higher peak numbers. For most real-world use (loading a page, video call), our numbers are closer to actual perceived speed.
Does running this use my data cap?
Yes. A single run transfers roughly 40-60 MB.
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