I used Beta 2 with no real issues, but with Beta 4, it's takes a LONG time to connect remote machine. I haven't actually timed it, but will try to.
Over a minute at least and seems longer. I don't actually see the remote machine screen at all during that time, just the "connecting" window. Windows 10, 20H2 on both machine. 1Gb fiber on both ends. Fortinet firewall on the connecting side. Home connection on client side. I haven't tried connecting the other way.