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iperf3 is popular because its in the router software stack and a good way to check the raw performance. I know from my own experience that iperf3 on windows performs fairly similar to Linux on a modern machine all the way up to 10 gbit/s. Its a theoretical problem not a practical one but if Microsoft has a better solution then they can open source it and do the work to include it in the open source router software and it will get used.

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If you read the article, the author shows iperf3 is slower than Microsoft's open source tools.

Nothing wrong if it works faster, but it's not impossible to make tools that are compatible with other standard testing programs. By intentionally ignoring the tools network engineers are already using every day Microsoft is really shooting themselves in the foot and showing that they are tone deaf to the needs of users outside of their walled garden.

How many routers do you know off the top of your head that run Windows?

Using v3.16 iperf3.exe I got 9.2 Gbps between Windows and Ubuntu. A single TCP connection. No -P flag needed.

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