Ok since it is a sharing application I suspect it needs to use part of your
internet speed to do this but the amount you seem to have slowed seems
excessive. If you go to a terminal and type top, this will show you the
running processes or alternatively and if you have it installed have a look
at your system monitor. If it is not showing up in the menu then I suspect
either you needed to install it via dpkg or it installs and starts working
and the way of controlling it isn't clear.
go to a terminal type dpkg -l | grep yuuguu, this will tell you if it has
installed and what bits have.