Pages passing all three Core Web Vitals see 24% lower abandonment on average. (Web.dev case studies)
Only an estimated 33-40% of websites pass all three CWV thresholds. (HTTP Archive Web Almanac)
LCP under 2.5s is the strongest single predictor of conversion lift among the three metrics. (Web.dev)
INP requires under 200ms response to pass; sites moving from poor to good INP have reported 5-15% conversion lifts. (Google)
CLS under 0.1 is the threshold; about 73% of mobile pages pass it. (HTTP Archive)
AVIF and WebP cut hero-image weight by 40-60%, the single biggest LCP lever. (Google web.dev)
Approximately 33-40% of websites pass all three Core Web Vitals on mobile. (Source: HTTP Archive Web Almanac)
Roughly 60-65% pass on desktop — desktop is consistently easier to pass than mobile. (Source: HTTP Archive)
LCP pass rate (under 2.5s) is approximately 55-65% of mobile pages. (Source: HTTP Archive)
INP pass rate (under 200ms) is approximately 70-80% of mobile pages. (Source: HTTP Archive (post-INP transition))
CLS pass rate (under 0.1) is approximately 73% of mobile pages — the easiest CWV to pass. (Source: HTTP Archive)
LCP threshold to pass: under 2.5 seconds. 'Needs improvement' is 2.5-4s. 'Poor' is over 4s. (Source: Google web.dev)
LCP under 2.5s is the strongest single predictor of conversion lift among the three CWV metrics. (Source: Multiple Web.dev case studies)
Pages with LCP between 2.5-4s lose roughly 10-15% of conversions vs. pages under 2.5s. (Source: Web.dev case studies)
Hero image is the LCP element on roughly 70% of pages — making image optimization the single highest-leverage LCP lever. (Source: Multiple LCP studies)
Preloading the LCP image with <link rel='preload'> can shave 200-800ms off LCP on mobile. (Source: Web.dev case studies)
Switching from JPEG to AVIF on the hero image alone can improve LCP by 0.5-1.5s on mid-range mobile. (Source: Google web.dev)
INP replaced FID as a Core Web Vital in March 2024. (Source: Google Search Central)
INP threshold to pass: under 200ms. 'Needs improvement' is 200-500ms. 'Poor' is over 500ms. (Source: Google web.dev)
Sites moving from poor to good INP have reported 5-15% conversion lifts. (Source: Google web.dev case studies)
The single biggest INP killer is heavy main-thread JavaScript; deferring non-critical JS is the primary fix. (Source: Web.dev guidance)
Third-party scripts are the most common source of poor INP — auditing and removing non-critical third parties is high-leverage. (Source: HTTP Archive Web Almanac)
CLS threshold to pass: under 0.1. 'Needs improvement' is 0.1-0.25. 'Poor' is over 0.25. (Source: Google web.dev)
CLS pass rate is the highest of the three metrics — about 73% of mobile pages pass. (Source: HTTP Archive)
The most common cause of poor CLS is images and ads loading without explicit width/height attributes. (Source: Web.dev guidance)
Adding explicit width/height (or aspect-ratio CSS) to all images and embeds typically resolves the majority of CLS issues. (Source: Web.dev codelabs)
Pages passing all three CWVs see 24% lower abandonment on average. (Source: Google Web.dev case studies)
53% of mobile users abandon pages that take longer than 3 seconds to load. (Source: Google)
Vodafone's CWV improvements reportedly lifted lead-generation conversions by 8% per their published case study. (Source: Google web.dev case study)
Many e-commerce case studies show 10-25% conversion lift after moving from failing to passing all three CWVs. (Source: Aggregate of Google web.dev case studies)
Only ~33-40% of websites pass all three CWVs on mobile. Passing puts you in the top tier.
LCP under 2.5s is the highest-leverage single metric. Optimize hero images first.
INP under 200ms requires reducing main-thread JavaScript. Defer everything non-critical.
CLS is the easiest pass: add explicit width/height or aspect-ratio to all images and embeds.
Passing CWVs is no longer just SEO hygiene — it's a measurable conversion factor with 5-25% lifts documented.
Three metrics: Largest Contentful Paint (LCP, target <2.5s), Interaction to Next Paint (INP, target <200ms), and Cumulative Layout Shift (CLS, target <0.1). INP replaced FID in March 2024.
Approximately 33-40% of websites pass all three CWVs on mobile, and 60-65% on desktop. Mobile is consistently the harder surface.
Yes, but as a tiebreaker rather than a primary ranking factor — and the conversion impact is now larger than the ranking impact. Pages passing all three see 24% lower abandonment on average and 5-25% conversion lift in published case studies.
CLS — add explicit width/height attributes (or CSS aspect-ratio) to every image, embed, and ad slot. This single fix typically clears CLS for most sites.
INP — because it requires reducing main-thread JavaScript, which often means auditing third-party scripts and refactoring app initialization. Worth the effort: INP improvements correlate with 5-15% conversion lifts.