The fallacies of web application performance http://blog.plataformatec.com.br/2017/07/the-fallacies-of-web-application-performance/
José Valim, inventor of Elixir, wrote an interesting blog post about the fallacies of web application performance. He writes about some common misunderstandings on this topic, including my favorite one: performance is only a production concern. Hint: it isn't!