ubun2

I have installed freenx server on my ubuntu 64bit amd box and connect through nomachine nx client from my ubuntu laptop. There is no problem in connecting. It connects perfectly fine and nomachine nx client is really cool, fast and easy to use.
 

Recently want to access my remote ubuntu machine. So i enabled remote access on my ubuntu. Tried to connect to the remote ubuntu machine using Remote Desktop Viewer. It connected very slowly after quite some time. But i was not able to do anything. It was very very slow and it takes ages to do something on the remote machine. The terminal server client works great connecting to windows machines and it is blazing fast. Why remote desktop to ubuntu is very very slow? Is there a way to fix this?

My work uses Cisco VPN for remote acess to office machines. I don't find a cisco vpn client for ubuntu. Is there a client / software that i can use to connect to my work's cisco vpn and use remote desktop?
This software must also include a feature to import my cisco vpn profile.