Growzai
Technical SEO

Core Web Vitals and Page Speed

Reading time: ~8 min

Page speed is a confirmed ranking factor. Users expect fast websites, and search engines reward them. Core Web Vitals are three specific metrics Google uses to evaluate user experience and page performance. Largest Contentful Paint (LCP) measures loading performance. It's the time it takes for the main content of a page to load. Google recommends LCP should occur within 2.5 seconds of the page starting to load. Images, videos, and large text blocks contribute to LCP. Optimizing images, using lazy loading, and leveraging content delivery networks (CDNs) all improve LCP. First Input Delay (FID) measures interactivity. It's the time between when a user first interacts with a page (clicking a button, typing in a form) and when the browser responds. Pages should respond within 100 milliseconds. Heavy JavaScript and long-running tasks block the main thread, increasing FID. Code splitting and reducing JavaScript can help. Cumulative Layout Shift (CLS) measures visual stability. CLS quantifies how much page elements shift around as content loads. A CLS score of 0.1 or less is considered good. Unexpected layout shifts frustrate users and increase bounce rates. Reserving space for images and ads before they load prevents layout shifts. Mobile performance matters more than ever. With mobile-first indexing, Google primarily uses the mobile version of your site for indexing and ranking. A fast mobile site is essential. Test your pages using Google's PageSpeed Insights to identify specific performance issues. Performance optimization techniques include image optimization (using modern formats like WebP), minimizing code, removing render-blocking resources, and enabling compression. Hosting quality also matters. Better hosting providers deliver content faster. Using a CDN distributes your content geographically, serving users from servers closer to them.

Key Takeaways

Core Web Vitals (LCP, FID, CLS) are Google's primary performance metrics
Page speed directly impacts ranking and user experience
Mobile performance is critical with mobile-first indexing
Image optimization, code minimization, and CDNs significantly improve speed

Your Action Item

Run your website through Google PageSpeed Insights and identify your top 3 performance issues. Create a plan to address them within 2 weeks.