You mean the author of the article or the book. It helps to know that author of the article started an Site Optimization platform and worked hard to build it, p

You mean the author of the article or the book. It helps to know that author of the article started an Site Optimization platform and worked hard to build it, probably spending too much time on it as well. Taking umbrage with any advice saying otherwise i.e don't spend too much time on performance, seems sensible since they took it personally.