Google defines good Core Web Vitals as Largest Contentful Paint (LCP) under 2.5 seconds, Interaction to Next Paint (INP) under 200 milliseconds, and Cumulative Layout Shift (CLS) under 0.1. Simple thresholds, in theory. In practice, only 47% of sites currently clear all three—which means roughly half of the web is leaving measurable revenue on the table.

The revenue math is no longer theoretical

When Rakuten cleaned up its LCP, it reported a 53% lift in revenue per visitor. That’s an extreme case, but the pattern holds broadly: sites that pass all three Core Web Vitals thresholds see conversion gains in the 15–30% range compared to sites that don’t, and a one-second delay in load time tends to cut conversions by roughly 7% on its own.

Where the points actually get lost

Unoptimized hero images, render-blocking scripts, and third-party embeds (chat widgets, tracking pixels, font loaders) are the most common culprits behind failing LCP and INP scores. Cutting 1–1.5 seconds from LCP, 200–300 milliseconds from INP, and 0.10–0.15 from CLS is realistically achievable on most sites without a full rebuild, and case studies consistently show 15–25% conversion lifts from exactly that scope of work.

• Compress and modern-format hero images (WebP/AVIF) and lazy-load everything below the fold.
• Audit third-party scripts—chat widgets and trackers are frequent INP offenders.
• Reserve space for images and ads before they load to eliminate layout shift.
• Move to a CDN and enable proper caching headers if you haven’t already.

“Sites that pass all three Core Web Vitals see conversion gains in the 15 to 30% range. That’s not a rounding error.”

What this means for your business

Core Web Vitals aren’t a vanity metric for developers to obsess over—they’re a direct line to conversion rate and, increasingly, to search visibility. With just under half the web passing all three thresholds, being in that 47% is a genuine competitive advantage, not just a compliance checkbox.