The Metrics That Actually Correlate With Revenue
Largest Contentful Paint and Interaction to Next Paint consistently correlate with conversion rate in the client data we’ve reviewed. Cumulative Layout Shift matters too, but mostly as a proxy for a rushed frontend rather than something users consciously notice — fix the rushed frontend and CLS usually improves as a side effect.
Where Teams Waste a Sprint
- Chasing a perfect Lighthouse score on a marketing page nobody actually complains about, while the checkout flow — the page that affects revenue — stays unmeasured.
- Optimizing image compression before fixing render-blocking third-party scripts, which is usually the bigger win.
- Treating lab data (Lighthouse) as equivalent to field data (real user metrics) — they routinely disagree, and field data is what matters.
Where We’d Spend the Next Sprint
Audit third-party scripts first — tag managers, chat widgets, and analytics snippets are the most common cause of a slow Interaction to Next Paint, and they’re usually the easiest fix once identified. After that, look at your actual Core Web Vitals field data by page template, not site-wide averages, and fix the highest-traffic template with the worst score first.