Make sure you open the ports TVUPlayer uses... also remember that you must have a connection faster then 512kbps to recieve best performance remembering that it's about peoples "upload" and your upload... so if u dont upload much the program wont give you the best performance... It's just how P2P tv works.. its about the upload of things.
so if the host has a low upload then everyone else connected is gonna recieve heaps of buffering.