A lot of that is just experience from practice. If a person has solved a given problem before they will be able to do it faster the next time. Another part of

A lot of that is just experience from practice. If a person has solved a given problem before they will be able to do it faster the next time. Another part of that is simply being hypo neurotic, low fear. If a person is hypo neurotic those conditions are just not stressful at all. For example being shot at by a violent aggressor is stressful but not writing code at a different time of day. It’s hard to explain unless you are that person or personally know someone who is. It’s also apparently a massive gaping hole in psychology. Neuroticism is generally viewed as negative, so the less of it the better. That does not account for the extreme states, that bottom 2%.