In practice repetition of this quote more often than not leads to a lazy attitude of "don't think about performance, it's too complicated, measure first and the

In practice repetition of this quote more often than not leads to a lazy attitude of "don't think about performance, it's too complicated, measure first and then let's talk". In my experience all great programmers think about performance from the moment they start thinking about a problem. Like, you're writing an O(n^2) nested loop over an array that's not going to be tiny? Get out of here! That just shouldn't happen and talking about "premature optimization" points in exactly the wrong direction.