Nobody likes to wait, especially not when we are talking about waiting for web applications. In this talk we will walk through all the phases of the lifecycle of a web application. This process has its starting point in the download of all the necessary resources such as HTML, CSS or JavaScript. Then your browser starts to process these resources in order to render the application. But your application’s life does not end when it is shown to the user. In a single-page application, your browser has got a lot of work to do and it’s your job to build the application in a way it can do its job in a quick and responsive way. You will learn what’s under the hood of your browser and how to analyse the performance of your application’s lifecycle.