SEO UTILITIES
PageSpeed Insights Checker — Core Web Vitals
Check a URL's Google PageSpeed Insights score and Core Web Vitals. These metrics reflect real loading, interactivity, and visual stability for users.
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Google PageSpeed Insights scores a page 0–100 on performance and reports its Core Web Vitals — the specific metrics Google uses to judge real user experience. Rather than a single 'how fast' number, it breaks speed into loading, interactivity, and visual stability, so it pinpoints what to fix, not just that something is slow.
The three Core Web Vitals
| Metric | What it measures | 'Good' threshold |
|---|---|---|
| LCP | Largest Contentful Paint — how fast the main content appears | ≤ 2.5 s |
| INP | Interaction to Next Paint — how responsive the page feels | ≤ 200 ms |
| CLS | Cumulative Layout Shift — how much the layout jumps around | ≤ 0.1 |
For the overall performance score, roughly 90+ is good, 50–89 needs improvement, and below 50 is poor. Aim to land all three vitals in the good range.
Frequently asked questions
- Why does my mobile score lag behind desktop?
- Mobile testing simulates a slower device and network — a much tougher environment than a fast desktop on broadband. Since so much traffic is mobile, that lower score reflects what many real visitors experience.
- What's the difference between lab and field data?
- Lab data is a single controlled test run, useful for debugging. Field data reflects measurements from real visitors over time and is the truer picture — though a page needs enough traffic for it to be available.
- Does improving these scores boost rankings?
- Core Web Vitals are a ranking signal, so improving them can help, especially against close competitors. But content relevance still matters more — treat good vitals as removing a handicap and improving experience, not a magic lever.