Core Web Vitals and rankings: what the correlation shows

Every few months a number resurfaces that sounds too clean to be true: some precise share of the web passes Core Web Vitals, and pages that pass supposedly rank higher because of it. Both halves of that claim exist in real data. Neither half says what the SEO folklore around it usually claims.

What the field data actually says#

The Chrome UX Report is the only public, large-scale measurement of how real visitors experience real pages, and the clearest citable read of it comes from the HTTP Archive’s Web Almanac. Its 2025 performance chapter, built on CrUX data through July 2025, puts the share of origins passing all three Core Web Vitals at 48% on mobile and 56% on desktop. Broken down by metric, mobile LCP is the weak link at 62% passing, against 77% for INP and 81% for CLS.

A widely repeated figure claiming 55.9% of origins passed as of May 2026 circulated in search results while researching this piece. It could not be traced to the CrUX dashboard, the HTTP Archive, or any outlet citing CrUX data directly, only to secondary blog posts restating each other. It is not used here for that reason.

What the correlation study found, and what it does not prove#

A Screaming Frog analysis pulled Core Web Vitals status for roughly 20,000 URLs ranking across 2,500 keywords in UK search results, using the PageSpeed Insights API against CrUX data. Position 1 results passed Core Web Vitals near 19-20% of the time; positions 5 through 9 flattened to roughly 10-11%, a gap the study’s own author describes as unlikely to mean Core Web Vitals is a hidden major ranking factor.

That hedge matters. A pre-filtered set of already-ranking URLs will tend to skew toward sites with more resources across the board: better hosting, more engineering attention, more mature content operations. A faster page and a higher-ranking page can share a cause without either one causing the other, and this study’s sample size and single-country, single-snapshot design mean it has not been replicated at a scale that would settle the question either way.

What Google itself says#

Google’s own page experience documentation is unambiguous about the ordering: Search “always seeks to show the most relevant content, even if the page experience is sub-par.” Page experience is described as something that can help decide between pages that are already similarly relevant, not a signal that competes with relevance directly. That statement, from the party that controls the ranking system being studied, is the strongest available evidence for how much weight Core Web Vitals actually carries, and it is consistent with both datasets above: real, measurable, and secondary to content.

What this means for prioritizing the work#

Treat Core Web Vitals as a floor, not a lever. If a site is failing LCP or INP outright, that is a defensible, evidence-backed fix: it removes a plausible tie-breaking disadvantage and, separately, protects conversion and user experience regardless of what it does to rankings. But do not sell Core Web Vitals work to a client or a stakeholder on the promise of a ranking jump from a passing score alone. The field data shows roughly half of origins already pass; the correlation data shows an association among sites that were already competing well; and Google says relevance decides first. Fix real failures, measure the outcome you actually control, such as bounce rate or conversion, and keep the ranking claim honest.