In the middle of a pandemic with many people working from home, Microsoft flat refuses to acknowledge that all of their VPN products have throughputs limited to about 10-50 Mbps. This includes not just DirectAccess and AlwaysOn VPN, but also their Azure VPN stack as well. I've never seen any MS VPN protocol crack 100 Mbps, even when using 1 Gbps fibre connections on both ends. We have customers getting ~1.5 Mbps effective in typical scenarios.

There are thousands of forum posts about this, with many referencing support tickets, etc...

The response from Microsoft is radio silence.