|We have remote desktop servers installed at the office for remote programers to use.
I did a lot of research on this, and they have special hardware that optimizes the remote workstation experience.
Plus you can setup a hyper visor, and run several virtual machines that serve as remote workstations, so you can load up 2 or 3 or them in the same box. With graphics, you need one hell of a GPU like the NVidia Quatro Card for fast processing.
Most slow remote sessions are from the host not being able to run fast enough, to send the remote screen data across the wire and back.
I know of a lot of companies in the middle east, in which the employees remote in from the UAE into Saudi Arabia, so they don't have to live there and work.
I just bought a Dell Solution and let my friend set it up for me, and it works fine. No complaints so far from my remote contractors.
As far as speed testing goes, I did planning first, so it wasn't really an issue.