Having worked with Linux for 14 years now I still surprised by the little things that come up to make my life easier. One such item is the ControlMaster settings in ssh_config. The simplicity reminds me of the time I realized I didn't always have to use cat and | to more a file.
I have to thank this post for the tip.
Add these lines to your ssh_config or .ssh/config
ControlMaster auto #Turn connection sharing
ControlPersist 4h #Keep the channel open
ControlPath /tmp/ssh_mux_%h_%p_%r #The control path
If you do a lot of ssh/scp work you will love this. The four hour persistence leaves the connection in the background for use as needed.
I read man pages for fun and have looked at ssh_config at least a dozen times. I am surprised I didn't notice this gem.