The F Secure SSH server then listens for connections on this port, forwards the connection request and any data over the secure channel, and makes a connection to the real X server from the F Secure SSH Terminal. Note that forwarding can be chained, permitting safe use of X applications over an arbitrary chain of SSH connections. F Secure SSH Server and SSH Terminal provide automatic forwarding for the X11 Windowing System commonly used on UNIX machines. However, not using strong encryption in all communications can have severe consequences. The startup time is on the order of a second on 486 or Pentium class machines connected to an ethernet, and on the order of a few seconds for long-distance connections.
Transfer rate means the number of bytes per second that can be transmitted over the secure channel.
Most of the time, transfer rate is not limited by encryption but by the transfer rate of the network. Furthermore, on long-distance connections using the SSH protocol can substantially speed up the transmission due to compression of transferred data. The strongest available encryption methods should be used, as they are no more expensive than weak methods. Due to compression of transferred data SSH protocol can substantially speed up long-distance transmissions.