I confirm, with all the remote desktop apps that exist today (for iPad or windows PC, and also with wired LAN) you cannot obtain a fluid video reproducing in your iPad from remote. Best you can do is about 10-15 fps.
There is an app that promise fluid remote video but is still in beta testing for iPad:
Demo video about using multiple monitors with MaxiVista
I wait for this app
I have used this demo before on PC. It is not designed as a remote desktop application as you may think. It's purpose is to extend 1 computers screen, onto a 2nd computer's screen. Probably similar to the Mac only application Air Display.
For example, you have 2 laptops side by side. It would allow 1 laptop to use the other laptop's screen as a secondary monitor for the 1st laptop.
for what I needed out of it, I found a freeware application. I wanted to use 1 keyboard\mouse across multiple computers, like a software KVM switch. (Input director)