Measure
Press Measure for response time, then download, then upload. It takes ten to twenty seconds.
Press Measure for response time, then download, then upload. It takes ten to twenty seconds.
Measures download and upload throughput, response time (ping) and jitter. The measurement runs against Cloudflare’s speed endpoints — it does not pass through this site’s server.
This tool exchanges data directly with Cloudflare’s measurement endpoint (speed.cloudflare.com). A run transfers up to 21MB down and 6MB up, and the other end is not this site. What is sent is filler with no content — none of your files or input is involved.
Questions
It is slower than the speed I pay for.
Advertised figures are maximums, not delivered speeds. And over Wi-Fi you may be measuring the Wi-Fi rather than the line — try it wired.
The number changes every time.
Normal. Lines are shared, so time of day and congestion move it. Read the trend across several runs, not one figure.
A dedicated app reports higher.
Browser-based measurement has limits that native apps do not. Use this for comparing before and after under matched conditions.
What is it talking to?
Cloudflare’s measurement endpoint; not this site’s server. Each run transfers up to 21MB down and 6MB up — worth knowing on a metered connection.
Wi-Fi is slow. What do I try first?
Check which band you are on. 2.4 GHz reaches further but runs slower and collides with microwaves and the neighbours; 5 GHz is faster but stopped by walls. Re-run the test standing next to the router on 5 GHz — a large change means the bottleneck is the Wi-Fi rather than the line. After that, move metal and fish tanks out of the path.
It is only slow in the evening.
Shared capacity. Fibre in an apartment block, or a congested local exchange, sags at peak hours. Measure at the same time on several days: a consistent evening dip points at the provider’s equipment, while day-to-day randomness points back at your own Wi-Fi and hardware.
Can I do other things while it runs?
The result will come out lower. Streaming during a test takes bandwidth the test cannot use. For an accurate figure, stop other tabs and other devices on the same connection first. If what you want to know is how the line performs while in use, leave them running.