These Performance best practices are the result of multi-role perspectives on software development.
There is no ranking for better practices. Some are applied more often and others produce awesome boosts.
But what really matters is to apply these practices where they make sense and where the users can benefit the most.

Egoless programming is a concept introduced by Gerald Weinberg in The Psychology Of Computer Programming. The idea is that programmers must fight the natural tendency to treat their programs as part of themselves, and therefore to reject all criticism. Rather, they should do their best to treat their designs & implementations as objects independent of themselves, and to view criticism dispassionately on its merits.