Well, I never get more than 40 to 50 Mbps. And in the last couple of days the servers tell me that I´m disconnected because of low bandwidth. The sim then reconnects after a short period of time, but it´s annoying anyway. Now the bottleneck isn´t the hardware you own, but the connection to the servers. If the connection isn´t perfect, I see stutters in VR.
It looks like there´s some sort of server problem in Europe or Germany. Maybe Microsoft will have to add some resources here.