Single-page applications (SPAs) present a unique approach to building web applications. They help to increase development velocity and can present big performance wins when it comes to delivering a fast and seamless user experience. Monitoring SPAs for performance still comes with a unique set of challenges, like choosing the most impactful metrics, gaining visibility into app performance over time, and knowing what metrics you can get from the browser. The main benefit of using SPAs is that a page does not need to reload when the content on the page changes. However, this feature, and the fact the page does not reload, is what makes it hard to monitor SPA performance.