Page Speed Insights
Page Speed Insights is a free web performance analysis tool developed by Google that evaluates the speed and user experience of web pages on both mobile and desktop devices. It provides performance scores, identifies optimization opportunities, and offers actionable recommendations based on metrics like Core Web Vitals (e.g., Largest Contentful Paint, First Input Delay, Cumulative Layout Shift). The tool analyzes real-world field data from the Chrome User Experience Report and lab data from simulated environments to give a comprehensive view of page performance.
Developers should use Page Speed Insights to diagnose and improve website performance, which directly impacts user engagement, search engine rankings (SEO), and conversion rates. It is essential for optimizing web applications, especially for mobile users, and for ensuring compliance with performance standards like Google's Core Web Vitals. Use cases include pre-launch testing of new features, ongoing monitoring of production sites, and benchmarking against competitors to maintain a competitive edge in user experience.