Core Web Vitals
Comprehensive Core Web Vitals monitoring with real-time tracking, Chrome UX Report integration, and intelligent performance optimization recommendations.
Overview
Core Web Vitals are Google's essential metrics for measuring user experience. ProRank SEO provides enterprise-grade monitoring with real-time measurement, historical tracking, and actionable insights to help you achieve and maintain excellent performance scores.
LCP - Loading
Largest Contentful Paint measures loading performance. Target: under 2.5 seconds
INP - Interactivity
Interaction to Next Paint measures responsiveness. Target: under 200 milliseconds
CLS - Stability
Cumulative Layout Shift measures visual stability. Target: under 0.1
Key Features
Real-Time Monitoring
Automatically measures Core Web Vitals on every page load using the official web-vitals library. Get instant feedback on your site's performance as you browse.
- Live metric updates without page refresh
- Color-coded ratings for instant assessment
- Automatic data persistence to database
- Browser-based measurement for accurate real-user metrics
Historical Data & Trends
Track performance over time with interactive charts powered by Chart.js:
Chart Features
- Customizable time periods (7, 30, 90 days)
- Individual metric selection
- Visual threshold indicators
- Trend analysis and pattern detection
- Automatic data aggregation
Multi-Page Analysis
Analyze up to 10 pages simultaneously with our batch audit feature:
- Click Run Full Audit to start comprehensive analysis
- System automatically selects your most important pages
- View side-by-side comparisons in table format
- Identify problem pages at a glance
- Export results for team review
Performance Budgets
Recommended Budgets
| Metric | Good | Maximum |
|---|---|---|
| LCP | 2,500ms | 4,000ms |
| INP | 200ms | 500ms |
| CLS | 0.1 | 0.25 |
| FCP | 1,800ms | 3,000ms |
| TTFB | 800ms | 1,800ms |
Chrome UX Report (CrUX) Integration
Access real user experience data from Google's Chrome User Experience Report:
- Field Data: Real user measurements from Chrome browsers
- P75 Values: 75th percentile scores for consistent benchmarking
- Distribution Analysis: See percentage of Good/Needs Improvement/Poor experiences
- Origin-Level Data: Aggregate metrics for your entire domain
Export & Reporting
JSON Export
Complete data for API integration and automation
CSV Export
Historical data for spreadsheet analysis
PDF Reports
Print-ready reports with recommendations
Automated Recommendations
Our intelligent recommendation engine provides specific, actionable suggestions based on your metrics:
LCP Optimization
- Optimize server response times (TTFB)
- Implement critical CSS and remove render-blocking resources
- Optimize and compress images
- Use CDN for static assets
- Preload key resources
INP Optimization
- Reduce JavaScript execution time
- Break up long tasks into smaller chunks
- Optimize event handlers and listeners
- Use web workers for heavy computations
- Implement request idle callbacks
CLS Optimization
- Set explicit dimensions for images and videos
- Reserve space for dynamic content
- Avoid inserting content above existing content
- Use transform animations instead of layout-triggering properties
- Ensure web fonts load without layout shift
Best Practices
Daily Monitoring Workflow
- Check dashboard each morning for overnight changes
- Enable Auto-Monitor during peak traffic hours
- Review performance budget alerts
- Address any new issues immediately
- Export weekly reports for stakeholder review
Optimization Priority
- Fix Poor ratings first - These directly impact user experience
- Improve Needs Improvement ratings - Prevent them from becoming poor
- Maintain Good ratings - Regular monitoring to prevent regression
- Metric Priority: LCP → INP → CLS → FCP → TTFB
Troubleshooting
Common Issues
No Data Showing
- Ensure JavaScript is enabled in your browser
- Check that web-vitals library is loading (v5.1.0)
- Wait 5-10 seconds for initial measurements
- Check browser console for errors
Different Scores from PageSpeed Insights
- Our tool measures real-time performance in your browser
- PageSpeed Insights uses lab data from controlled environments
- Network conditions and device capabilities affect scores
- Both measurements are valuable for different purposes
Metrics Not Updating
- Clear browser cache and reload
- Disable ad blockers temporarily
- Check REST API endpoints are accessible
- Verify database table exists and is writable
Frequently Asked Questions
How often should I check Core Web Vitals?
Check daily for critical pages, weekly for all important pages, and immediately after any major changes.
Why do scores fluctuate?
Scores vary based on network conditions, server load, browser cache state, third-party scripts, and user location.
What's the difference between field and lab data?
- Field data (CrUX): Real user measurements from Chrome browsers
- Lab data: Controlled testing environment measurements
- Both are important for complete performance understanding
Should I aim for perfect scores?
Focus on meeting the "Good" thresholds first. Perfect scores aren't always necessary or practical. Prioritize user experience over perfect metrics.