All other things being equal (and they don’t have to be), a group will slow their performance down to the slowest that is accepted by the leader or other team members.
Find people that get things done to be on your team. You know the kind…they walk into a room and things speed up and get accomplished. It’s their nature. They are hard to find, but without one here and there in each department, things tend to drag on forever.
Who is an “Accelerant” on your team?