Efficiency, which is doing things right, is irrelevant until you work on the right things.
Efficiency for me is an obsession..It not only helps me get stronger but makes things simpler.
That transcends everything - skipping the transfer of dailies is a game-changer.
Minimize your therbligs until it becomes automatic; this doubles your effective lifetime - and thereby gives time to enjoy butterflies and kittens and rainbows.
Highland has changed my entire way of working with scripts. I use it every day.
I like to shoot a lot of choices. I like a lot of stuff - and so I push to go faster, to shrink the time between the takes so that the takes are what you're spending all your time on.
But now they have it down to a real science where it's about an hour.