Skip to main content
Core Web Vitals Issues
Troubleshooting Performance Core Web Vitals

Core Web Vitals Issues

Overview

Core Web Vitals issues occur when a webpage fails to meet Google’s performance thresholds for user experience. Core Web Vitals measure three key aspects of page performance: Largest Contentful Paint (LCP), Interaction to Next Paint (INP), and Cumulative Layout Shift (CLS). These metrics evaluate how quickly content loads, how responsive the page is to user input, and how stable the layout remains during rendering.

If these metrics exceed recommended limits, users may experience delayed loading, slow interaction, or visual instability.

Common Causes

  • large images or media files delaying Largest Contentful Paint
  • render-blocking CSS or JavaScript preventing initial page rendering
  • excessive client-side JavaScript increasing interaction latency
  • dynamic content inserting elements that shift page layout
  • slow server response delaying the first content render

How the Problem Appears

  • performance reports showing poor Core Web Vitals scores
  • pages loading slowly before primary content appears
  • layout elements shifting while the page loads
  • delayed response when users interact with buttons or forms
  • Search Console reporting Poor URLs in the Core Web Vitals report

How It Is Diagnosed

  • reviewing the Core Web Vitals report in Google Search Console
  • running page performance audits using Lighthouse
  • analyzing page load metrics in Chrome DevTools Performance panel
  • inspecting layout shifts using browser rendering diagnostics
  • measuring real-user metrics using Chrome User Experience data

Typical Fix

  • optimize large images and deliver them in modern formats
  • defer or asynchronously load non-critical JavaScript
  • reduce unused CSS and script execution during initial load
  • reserve layout space for images and embedded content
  • improve server response time to reduce initial page load delays

Technical Website Support

If Core Web Vitals problems are affecting page experience or search performance, technical troubleshooting may be required to identify performance bottlenecks and improve loading behavior.