Page Speed vs Core Web Vitals
Differences, use cases, and when to use each
Page speed is the general measure of how fast a page loads. Core Web Vitals (LCP, INP, CLS) are Google's specific user experience metrics that became a direct ranking signal. CWV is a subset of page speed focused on user experience.
Quick Comparison
| Feature | Page Speed | Core Web Vitals |
|---|---|---|
| Scope | Overall loading time and performance | Three specific UX metrics (LCP, INP, CLS) |
| Ranking Impact | Indirect influence | Direct ranking signal since 2021 |
| Metrics | TTFB, FCP, load time, etc. | LCP (<2.5s), INP (<200ms), CLS (<0.1) |
| Measurement | Synthetic and lab data | Real user data (field data) |
| Priority | Development optimization | SEO ranking factor |
When to Use Each
When to Use Page Speed
Monitor general page speed during development to identify and fix performance bottlenecks: server response time, JavaScript execution, image optimization, and caching.
When to Use Core Web Vitals
Monitor Core Web Vitals as your primary SEO performance metric. Google Search Console reports CWV scores that directly influence rankings — prioritize passing all three thresholds.
Pros & Cons
Page Speed
Core Web Vitals
Verdict
Optimize for Core Web Vitals to improve rankings and user experience simultaneously. General page speed optimization typically improves CWV as a result. Use Google Search Console to track real CWV data.