Even though this article's title sounds like it, this isn't meant to be flippant: https://danluu.com/sounds-easy/ https://danluu.com/sounds-easy/ Also see the

Even though this article's title sounds like it, this isn't meant to be flippant: https://danluu.com/sounds-easy/ https://danluu.com/sounds-easy/ Also see the other child comment: Once you have a significant amount of revenue, investing the effort improve things by 0.1% (or even 0.01%) can have a not-insignificant impact on the bottom line.