"The boss" is not who says what is good enough. Ultimately it's the customer. In many industries it seems good enough is not very good.

Then there are industries where the customer complains if code is slow. They will actually hire expensive consultants to analyze and benchmark the code. And while the consultants likely are not more talented than inhouse staff, now you have both sides very interested at looking at the problem from engineering perspective.

In this case "good" includes performance.