I listened to an interview with Patrick Collison were he claimed that when coding one should always optimize for speed - even when speed is not an issue. (Presumably because it leads to good coding practices, clean code, less build up of unnecessary functionality etc.)
Assuming that is correct - and I think there is something to it - it makes me wonder: is there something similar that one could optimize for in life? Life is such a multivariate thing that it can at times be hard to know what to prioritize.
What parameter is a candidate for having most positive side effects on your life when optimized?