Windows iperf3
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Download iperf-3.13-windows-x64.zip and save it to your computer, eg in your Downloads folder.
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			Saved to Downloads folder
Right click on it, and select Extract all.
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			Extract
Open up the Command Prompt - Start - cmd
In the black box type: cd Downloads\iperf-3.13-windows-x64
Run an speed test by typing:  iperf3.exe -c speedtest.aa.net.uk (you may need to click 'allow access' if a Windows Defender window pops up
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			Results
By default, this will run a single-thread upload speedtest (sending traffic TO the speed test server).
There are variations you can do to test the speed as follows:
- Run a single-thread  Download test:  iperf3.exe -R -P1 -c speedtest.aa.net.uk
- Run a single-thread Upload test: iperf3.exe -P1 -c speedtest.aa.net.uk
- Run a 10-thread Download test: iperf3.exe -R -P10 -c speedtest.aa.net.uk
- Run a 10-thread Upload test: iperf3.exe -P10 -c speedtest.aa.net.uk