Linux.com: Accelerating OpenSSH connections with ControlMaster

“OpenSSH 4.0 introduced an interesting new feature called
ControlMaster that allows it to reuse an existing connection to a
remote host when opening new connections to that host. This can
significantly reduce the amount of time it takes to establish
connections after the initial connection. Let’s see how this can
help you work faster, and how to start using ControlMaster right
away.

“The reduced connection times that the ControlMaster feature
provides are particularly nice when you’re using tools that open
multiple SSH connections to do work on a remote server…”

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