I'm trying to get VirtualBox seamless mode to work on all of my monitors at once. I was directed to this link, so I followed the instructions, using the windows port of rdesktop 1.6 found here, and using Xming as an X server.

I eventually finally got it to work! However, it's really slow. While VirtualBox's regular seamless mode is as performant as if I was running apps on my host machine, with rdesktop it takes 1-2 seconds to register any user input. Dragging windows around is laggy and buggy (pieces of the desktop behind the window show through). I'm simply connecting to localhost, so network bandwidth/latency shouldn't be an issue... anyone have any idea why it's so slow and what I can do to make it more performant?