LCP, INP and CLS aren't just developer metrics — they're revenue metrics. Here's how speed translates into rankings and conversions.
Why Google cares about speed
Core Web Vitals measure real user experience: how fast content loads (LCP), how quickly pages respond to taps (INP) and how stable layouts stay (CLS). Google uses them as ranking signals because users abandon slow sites — 53% of mobile visitors leave pages that take over 3 seconds.
The three metrics that matter
LCP should be under 2.5s — optimize hero images, server response and render-blocking resources. INP replaced FID and should be under 200ms — trim JavaScript and break up long tasks. CLS should stay under 0.1 — always set dimensions on images, ads and embeds.
Speed is a conversion strategy
Every 100ms of load-time improvement lifts conversions measurably — Deloitte found 0.1s faster mobile sites grew retail conversions by 8%. Treat performance work as revenue work, and it becomes easy to prioritize.
Frequently Asked Questions
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