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The Performance API is a set of standards for measuring and evaluating performance metrics with JavaScript. This article demonstrates how to use the Performance API to generate performance metrics directly in the DOM to create your own reporting.
Starting in March 2024, Interaction to Next Paint will formally replace First Input Delay as a Core Web Vital metric. Learn how the two metrics differ, why we needed a new way to measure interaction responsiveness, and how you can start optimizing the performance of your site now for a seamless transition to the latest Core Web Vital metric.