The evil is that overtime products add more and more features. When a feature is added and it slows down the app only 2%, they think it is no biggie. But overt

The evil is that overtime products add more and more features. When a feature is added and it slows down the app only 2%, they think it is no biggie. But overtime they ship 40 features in that way... and now the app take 220% more time. It just slowly happen overtime and that it is why they may not notice it. Products need to have performance tests with time limits that you do not want to compromise overtime.