I have 2 hosts that are connected via a 40GB network on the same physical switch and when I try to vmotion from one host to another (local storage to local storage) It takes 15 minutes to move a VM that is only 26GB.
MTU is set to 9000 on the DVS and 9218 on the switch. I can ping with Vmkping with packet size of 8972 across the vmotion interfaces just fine.
This is running ESXi and vCenter 6.7u3