I have seen various issues regarding certain Broadcom drivers, and Hyper-V on HP/ Dell servers. A ping time between VMs on the same host can be 60-100ms and file copies painfully slow.
The advice is to disable the VMQ features.
Show all network adapters, look for the column “Enabled”
disable-netadaptervmq -name <adaptername>
Disable VMQ for specific network interface
Disable VMQ on all network interfaces