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NJL is correct that the reason for your performance problem is the limited receive window size of 212992 bytes offered by the server.

As the receiver is a windows 2008 the following command can grow the RWIN per

netsh int tcp set global autotuninglevel=experimental

experimental: allows the receive window to grow to accommodate extreme scenarios (not recommended, it can degrade performance in common scenarios, only intended for research purposes. It enables RWIN values of over 16 MB)

As stated it might speed up your iperf throughput on this high latency speed test but may be detrimental to your other traffic . Regards Matthias