What is the primary purpose of PageSpeed Insights, a tool from Google?

PageSpeed Insights (PSI) is a Google tool specifically designed to report on the performance of a page on both mobile and desktop devices. Its primary function is to analyze a web page's speed and overall user experience, providing data based on Core Web Vitals metrics like Largest Contentful Paint (LCP), First Input Delay (FID), and Cumulative Layout Shift (CLS). This helps developers identify and fix performance bottlenecks. Measuring social media engagement is handled by analytics tools, not PSI. While security is crucial, PSI doesn't evaluate encryption; that's typically done through browser security indicators or specialized security audits. PSI also doesn't primarily analyze design and layout, though performance can indirectly impact user perception of design.