For evaluating frontend efficiency, Core Web Vitals like Largest Contentful Paint (LCP), Interaction to Next Paint (INP), and Cumulative Layout Shift (CLS) are paramount as they directly reflect user perception of loading, interactivity, and visual stability. Additionally, other critical loading metrics such as First Contentful Paint (FCP) and Time to Interactive (TTI) offer deeper insights into when content becomes visible and truly usable. Monitoring the JavaScript bundle size and CSS file size is essential, as bloated assets significantly hinder initial load times and overall performance. Beyond initial loading, metrics related to runtime performance, including frame rate during animations and memory usage, are vital for ensuring a smooth and responsive user experience throughout their session. Ultimately, these most relevant metrics collectively provide a comprehensive view of how quickly and smoothly users can interact with the application, directly correlating to user satisfaction and conversion rates. More details: https://www.pinterest.com/77gvv777/inforblog/