cFos Speed Test

With this speed checker you can quickly test the speed of your Internet connection. For example you can verify if your Internet speed matches the promised values. Don't be alarmed if the speed check doesn't match the exact values your ISP gave you. For example if you have a broadband speed of 16Mbit/s, 1% tolerance is already 160.000 bit/sec, which looks impressive but makes no big difference.


For now, the speedtester measures two values: The upload and the download speed. To test the Internet connection, the speed test also determines the response time of the server. This gives you an idea of how reliable the test results are.

Please note that the test results may be too low while cFosSpeed is in the calibration phase. You can calibrate cFosSpeed Traffic Shaping by running a RX speed test 1-2 times and then a TX speed test 1-2 times. You can verify the cFosSpeed calibration here.

> debug console ready!

cFos Speed Test v1.1

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RX speed:
TX speed:
Response time:
Test size:
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The meaning of the speed test results
Speed test results indicate the speed of TCP/IP payload data. cFosSpeed indicates raw IP speed in the status window. The difference is about 5%. 'Response time' is the time for full HTTP request. cFosSpeed indicates the ping time of the internet near you.

If you don't have other simultaneous traffic, this test measures your raw line speed. To test the effect of cFosSpeed Traffic Shaping you need at least two connections, e.g. a long mail upload and a download speed test. Test with and without Traffic Shaping enabled to see the difference.

Speed Problems? Maybe the cFos Speed Guide can help.
Note: cFosSpeed's MSS (MTU) optimization may reduce you MSS/MTU from 1492 to a little lower value. With ATM based DSL networks this can result in higher throuput, even if some "net speed test" pages say otherwise. But MSS (MTU) optimization can interfere with some games, so best you do the speed check with and without MSS (MTU) optimization yourself.