A tip to speed up commands on ssh significantly, especially for long running sessions. (Note – All the instructions are only for Ubuntu 12.04)

1. Put the following in ~/.ssh/config

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 Host *
    ControlMaster auto
    ControlPath ~/.ssh/auth/%r@%h:%p
    ControlPersist yes

1. chmod 600 ~/.ssh/config
2. mkdir ~/.ssh/auth

and Voila!

In my testing, the ssh connect and exit time to a test instance, dropped from 5.25-5.28 sec to 0.84-0.87 sec.