Awards, Barometers

So-net, the best fixed Internet performances

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Barometer of fixed Internet connections in Japan

H2 2021 – H1 2022

So-net provided the best broadband Internet performances in Japan during the last two semesters.

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The nPerf score, expressed in nPoints, gives an overall picture of the quality of a connection. It takes into account the measured bitrates (2/3 Download + 1/3 Upload) and the latency. These values are calculated on a logarithmic scale to better represent the perception of the user.

The nPerf analysis  

This study is based on tests carried out by users of the nPerf web speed test.

Between July 1st, 2021 and June 30th, 2022 we counted in Japan 180.054 speed tests, distributed as follows:

 So-net takes the crown of the Japanese broadband Internet.

Its clear-cut victories on all the KPI contribute to its easy triumph in our newest barometer. By showing outstanding symmetrical speed figures, and being the only provider under 20 ms of latency, its 172 400 nPoints and the large score gap with the rest of the contenders are fully deserved (>20k nPoints).

So-net subscribers enjoyed the best average broadband download speed, during the last two semesters.

With a mind-blowing average speed of 314 Mb/s, the Sony subsidiary makes the difference compared to its rivals, offering more than 100 additional Mb/s than its closest competitor in this field, i.e. au one net (KDDI).

So-net subscribers enjoyed the best average broadband upload speed, during the last two semesters.

Excepting J:COM, which stays out of the race with a 8 to 9 times inferior speed than the leader of this KPI, it is important to state that Japanese have offered a more than symmetrical upload speed, with an enormous average bitrate of 200 Mb/s, i.e. higher than for downloading, which is a very rare phenomenon abroad ! If J:COM had offered similar bitrates than for downloading, SoftBank would have got the last position again, even if its throughputs would be huge anywhere else.

Au one net and NTT, in the battle for the second place.

Those ISP have done a good work throughout the period, and even if they finish 20k nPoints under the leader, they will surely fight to be considered the main opponent to the Sony subsidiary. Their scores are tight (respectively 152k and 151k nPoints, approx.), and, if we didn’t consider So-net in the panel, the KDDI subsidiary would have won the download and upload speeds, while NTT would have been the best in latency measures.

SoftBank and J:COM, in need of a technological leap forward.

With almost 30.000 score points of delay for these operators, the victory is clearly out of their reach by now. Even if significant efforts were done, this gap looks too large too big to catch up with the first positions in the mid term. 

nPerf offers an Internet speed test application, which can be used for free at Everyone is free to use nPerf to measure the quality of their Internet connection. The panel of this study is formed by our users in Japan. 

The nPerf study is based on tens of thousands of tests carried out monthly, exclusively by the operators’ end customers, which makes it the “crowdsourced” study based on one of the largest panels of the country.

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