Performance API
The Performance API is a web standard that provides a set of interfaces for measuring and monitoring the performance of web applications, including navigation timing, resource timing, and user-centric metrics. It allows developers to collect precise timing data about page loads, network requests, and user interactions directly in JavaScript. This enables performance optimization, debugging, and real-user monitoring (RUM) to improve user experience.
Developers should learn and use the Performance API when building web applications that require performance optimization, such as e-commerce sites, media-rich applications, or progressive web apps (PWAs), to identify bottlenecks and enhance load times. It is essential for implementing performance budgets, A/B testing different optimizations, and gathering field data from real users to prioritize improvements based on actual impact.