Why is Xming XDMCP with lightdm very slow?

view full story

http://askubuntu.com – I allowed XDMCP access on my Ubuntu box and installed Xming on the Windows box that is on the same corporate network. When I try start the XDMCP session from windows it works out well. I see the pink Ubuntu login screen (lightdm) on the windows machine and I provide my password. But then it hangs when it is booting and it takes ages! I tried to do it without the -clipboard option and with the -once option but it does not help... Please any help...!??? (HowTos)