After having my installation of the Windows 10 updated, I've had some major problems while trying to connect to the machine via RDP - the connection either took too long to be established or it had been working with interrupts (auto-reconnects), i.e. very slow (almost unusable).
For example, one of the errors I have encountered is pictured below:
In the end, the solution that seems to have solved it is to configure the RDP service to use only the TCP protocol by using gpedit.msc.
You can see how this is done below - please notice that there are two settings available - one for the client and one for the host (adjusting the latter should do it):
If you still have any problems, you could try changing the TCP/IP auto-tuning by entering this command in command prompt (Run as Administrator):
netsh interface tcp set global autotuning=disabled