When designing systems and deciding on the architecture, I often hear justifying the use of microservices and other complex solutions because of the predicted performance and scalability needs. Out of curiosity then, let's test the limits of an extremely simple approach, the simplest possible one. Let's test a single instance of an application, with a single instance of a database, deployed to a single machine, and answer the question: How many HTTP requests per second can a Single Machine handl...