The Core Web Vitals That Actually Move Conversions
April 22, 2026 · 5 min read · Zenstack Team
Performance work is easy to over-invest in the wrong places. Shaving 200ms off a metric nobody notices doesn't move revenue; a slow, janky checkout flow does.
Largest Contentful Paint and Interaction to Next Paint tend to correlate most directly with bounce rate and conversion on marketing and e-commerce pages, because they map to how fast a page feels usable.
We start performance audits by identifying the pages that carry the most business weight — landing pages, checkout, sign-up — and optimize those first, rather than chasing a uniform score across the whole site.
Image optimization, font loading strategy, and reducing third-party script weight account for the majority of real-world gains we see on client sites.
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