You can make connections faster for ssh, rsync, hg, git, emacs, etc by using a shared ssh connection instead of creating a new connection every time.

!!! Method One - .ssh/config

Add the following to your {{~/.ssh/config}}.

{{{
Host *
  ControlPath ~/.ssh/master-%l-%r@%h:%p
  ControlMaster auto
}}}

If you want aliases created, you can also add

{{{
Host machine1
  User yourname
  HostName machine1-long-name.domain.com

Host machine2
  User yourname
  HostName machine2-long-name.domain.com
}}}

Now, instead of typing

{{{
$ ssh [yourname@]machine1-long-name.domain.com
}}}

You can simply do

{{{
$ ssh machine1
}}}

Any subsequent connections that machine will be very fast and use the same connections.

More information
* [http://www.saltycrane.com/blog/2008/11/creating-remote-server-nicknames-sshconfig/]
* [http://protempore.net/~calvins/howto/ssh-connection-sharing/]
* [http://blogs.perl.org/users/smylers/2011/08/ssh-productivity-tips.html]

!! Making a new connection

If you want to use a different connection options, you must open a new connection instead if reusing the existing one.  You do this by setting the {{ControlPath}} to {{none}}.  For convenience, the {{-S}} flags sets the {{ControlPath}} on a per-process basis.

{{{
$ ssh -S none -Y example.com
}}}

{{

!!! Method Two - For Emacs

If you only want to improve your emacs performace, in your {{~/.emacs}} file, add

{{{
(require 'tramp)
(setq tramp-default-method "scpc")
}}}

When you open a file, open as

{{{
/host:/path/to/file
}}}

It will be noticably faster.
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[Networking.SSH | CategoryComputing.Networking.SSH] : [Performance | CategoryComputing.Performance]