10 Core Web Vitals and Their Impact on SEO
Google has been consistently evolving how it ranks websites, and with the introduction of Core Web Vitals, it’s clear that user experience is now central to SEO. These metrics directly impact how your site performs in search results—and ignoring them can cost you valuable traffic. According to a Google Search Central report, pages that meet the Core Web Vitals criteria have a 24% lower bounce rate and a higher chance of ranking on page one. In this blog, we’ll walk you through the 10 Core Web Vitals (both official and extended performance metrics) that affect your SEO rankings and what you can do to fix issues that arise. What Are Core Web Vitals? Core Web Vitals are a set of performance signals that reflect how users experience the speed, responsiveness, and visual stability of a webpage. Initially, Google focused on three main metrics: Largest Contentful Paint (LCP), First Input Delay (FID), and Cumulative Layout Shift (CLS). Over time, more metrics were adopted to support a more complete picture of user experience. Understanding these metrics is crucial for any successful core web vitals SEO strategy. 1. Largest Contentful Paint (LCP) What it measures: Loading performance. Specifically, the time it takes for the largest content element (like an image or heading) to become visible. Good score: ≤ 2.5 seconds Impact: A slow LCP makes users abandon pages quickly, signaling poor performance to Google. Fix it with: Proper image optimization, using lazy loading, and eliminating render-blocking resources. Pro Tip: Use PageSpeed Insights to locate slow-loading elements and prioritize loading above-the-fold content. 2. First Input Delay (FID) What it measures: Interactivity. The time between a user’s first interaction (like a click) and the browser’s response. Good score: ≤ 100 ms Note: FID is being replaced by Interaction to Next Paint (INP), which we’ll cover next. Fix it with: Reducing JavaScript execution time and minimizing third-party scripts. 3. Interaction to Next Paint (INP) What it measures: A more comprehensive view of responsiveness than FID. INP considers all interactions throughout a user’s session. Good score: ≤ 200 ms Fix it with: Deferring non-critical JavaScript and eliminating long tasks. Use Chrome User Experience Report to analyze INP. 4. Cumulative Layout Shift (CLS) What it measures: Visual stability. It tracks unexpected layout shifts that occur while a page loads. Good score: ≤ 0.1 Fix it with: Defining dimensions for images and videos, avoiding dynamic content injections. 5. Time to First Byte (TTFB) What it measures: Server responsiveness. The time between a user’s browser requesting a page and the server’s response. Ideal score: ≤ 200 ms Fix it with: Upgrading to faster hosting, reducing server response times, and using CDN services like Cloudflare. 6. First Contentful Paint (FCP) What it measures: How long it takes for the first piece of DOM content to render (text/image). Good score: ≤ 1.8 seconds Fix it with: Compressing assets, preloading fonts, and using WebP format for images. 7. Total Blocking Time (TBT) What it measures: The total time a page is blocked from responding to user input between FCP and Time to Interactive (TTI). Ideal score: ≤ 200 ms Fix it with: Splitting long JavaScript tasks and reducing the impact of third-party code. 8. Time to Interactive (TTI) What it measures: The time it takes for a page to become fully interactive. Good score: ≤ 5 seconds Fix it with: Prioritizing critical scripts and lazy-loading non-critical ones. 9. Speed Index (SI) What it measures: How quickly the content of a page is visibly populated. Good score: ≤ 3.4 seconds Fix it with: Minimizing main-thread work and compressing text-based resources with Gzip or Brotli. 10. Navigation Timing (Extended Metric) What it measures: Overall user navigation experience including DNS lookup, redirect time, and more. While not officially part of the “Core 3,” this extended metric provides context about full user journeys. Fix it with: Reducing DNS lookups, limiting redirects, and enabling keep-alive headers. How Core Web Vitals Affect SEO The core web vitals SEO relationship is direct and measurable. Google has publicly stated that Core Web Vitals are ranking signals. When your site performs well on these metrics, not only do users stay longer, but search engines reward your page with better visibility. In fact, Backlinko noted that sites on the first page of Google tend to load 87% faster than those on page two. This makes Core Web Vitals one of the most overlooked SEO tactics for high impact. Pro Tip: Core Web Vitals are not just for developers. SEO professionals should work closely with the technical team to regularly audit and monitor these scores. Tools to Monitor and Fix Core Web Vitals Google Search Console: Offers a detailed Core Web Vitals report based on real user data. Lighthouse: Chrome tool for auditing page speed and UX. WebPageTest: Provides waterfall charts and advanced diagnostics. GTmetrix: Combines Google and Lighthouse data for insights and suggestions. These tools help detect what’s slowing your pages down and offer actionable fixes. Final Thoughts Optimizing for Core Web Vitals isn’t optional—it’s a core requirement for modern SEO success. Search engines and users both demand fast, responsive, and stable websites. By integrating Core Web Vitals into your ongoing technical SEO audits, you’ll improve your rankings, lower bounce rates, and create a more delightful experience for every visitor. Want to go deeper into technical SEO? Read our related guide: Schema Markup Errors and How I Fix Them. Also Read: Social Captions That Increase Engagement by 3X How the Instagram Algorithm Works in 2025 & How to Beat It The Right Way to Ask LinkedIn Experts for Article Contributions
10 Core Web Vitals and Their Impact on SEO Read More »