Based on this website the expected network bandwith of a Standard_D4s_v3 is 2000 Mbps (2000 mega bits per second).
Your screenshot shows the result of 228,667 MB/s (228,667 Mega Bytes per second).
1 Byte = 8 Bit
228,667 Mega Bytes per second (MB/sec) x 8 = 1829,336 mega bits per second (Mbps)
1829 Mbps vs 2000 Mbps is close to the expected network bandwidth .... at least it's my opinion.
Maybe this is helpful.
Regards
Andreas Baumgarten
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