Core Web Vitals vs PageSpeed score: which one matters for SEO?
These two get confused constantly. Core Web Vitals are real-user performance metrics (LCP, INP, CLS) that Google uses as a ranking signal. The PageSpeed Insights score is a synthetic lab test number from 0–100. Only Core Web Vitals affect rankings; the lab score is just a diagnostic tool.
Optimize for Core Web Vitals (real-user data from your actual visitors), not for the synthetic PageSpeed score. Use PageSpeed Insights as a diagnostic, but the score itself isn't a ranking factor.
Side-by-side breakdown
| Dimension | Core Web Vitals | PageSpeed Insights Score |
|---|---|---|
| Data source | Real users (CrUX) | Synthetic lab test |
| Affects rankings | Yes (confirmed factor) | No (diagnostic only) |
| Where to check | Search Console, CrUX | PageSpeed Insights tool |
| Pass threshold | 75% of users meet 'good' for all 3 | Score 90+ is 'good' |
| Update frequency | Monthly rolling 28-day window | Each test run |
| Why it gets confused | Same tool reports both | PageSpeed page shows both |
Who should choose what
Choose Core Web Vitals if…
All SEO-driven optimization. Track Core Web Vitals in Search Console > Page Experience and CrUX (Chrome User Experience) data.
Choose PageSpeed Insights Score if…
Diagnostic only. Useful for finding specific opportunities (unused JavaScript, oversized images) but the number itself doesn't affect rankings.
Still not sure which is right?
Book a free strategy call. We'll review your situation and give you a clear, no-spin recommendation.
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