System: Fedora 21 x86_64 8 GB Nvidia
This problem happens independend from the OS the partner is using.
We had it between Linux only systems, same as Linux and Windows.
Sometimes, the remote control feature leads to a sllllloooooooowwwwwwly
You can see every step with a FPS of 1 ! or less.. Reconnecting a new
call and trying again, may or may not solves it.