嗯，效果非常好。

出處： GitHub hack: speed up git push and git pull

建議除了ControlMaster 及 ControlPath、還要指定ControlPersist
(設定時間，如https://github.com/PeterDaveHello/Unitial/blob/master/ssh_config)

這部分在Open SSH Manual有說明(http://www.openssh.com/manual.html)：
> When used in conjunction with ControlMaster, specifies that the master connection should remain open in the background (waiting for future client connections) after the initial client connection has been closed.

這樣就不用特別開一個連線掛在那邊，反正時限內持續有人在重用連線，那他就會繼續活著~