Google uses a set of metrics called Core Web Vitals to grade user experience. Good copywriting is no longer enough — your site must be fast, highly responsive, and structurally stable. If you ignore these scores, competitors will outrank you.
Three Pillars of Core Web Vitals
1. LCP (Largest Contentful Paint) — Loading Performance: Measures how long it takes to paint the largest visible block (header, hero image) on the screen. Anything under 2.5s is optimal; over 4.0s will hurt your position.
2. INP (Interaction to Next Paint) — Responsiveness: Measures the latency of user interactions like clicking a button or menu tab. A good score is under 200 milliseconds.
3. CLS (Cumulative Layout Shift) — Visual Stability: Measures unexpected layout shifts. Have you ever tried to read a line and it shifts suddenly because an image finishes loading, causing you to misclick? That's CLS. The target is 0.
The Business Impact
The logic is simple: better performance = better ranking = more organic views = more customers. Slow speed directly reduces conversion rates. Users will abandon carts if a checkout page hangs.
How to optimize scores
Fixing Core Web Vitals requires coding discipline: reducing image sizes, eliminating blocking scripts, serving optimized formats, and using fast cloud hosting. This is why bloated templates often fail these tests.