Together, we’re faster.
But not necessarily in the way you’d expect.
Working partly as a developer, I can definitely tell when working together is more efficient, and when it’s not.
However, I think that in terms of sharing knowledge, it’s more efficient to work in groups of two or three people, as opposed to working alone.
Cutting an onion with three knives is certainly slower than doing it with only one knife.
But trying to learn how to cut an onion on your own will certainly be slower than having someone show and teach you how to do it.
Think of it.
Sometimes, taking 30 seconds of your time to give a bit of knowledge to someone could save hours if not days to this person.