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I’ve dealt with performance in many projects. And I’ve consistently seen that there were no adequate performance requirements stated, no representative load tests in place, no useful performance monitoring in production and no tuning based on facts. What typically did occur was: stress in acceptance, working overtime to fix suspected pieces of code, stress in production, complaining users and one party blaming the other with growing hostility. So, nasty things happen. The question is: Are these nasty things necessary? My answer is: no, they are not.