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Slow interactions can frustrate Shopify shoppers even when pages appear to load quickly. This blog explains why INP deserves early attention during a Core Web Vitals audit in 2026. It covers INP, LCP, CLS, main-thread blocking, app scripts, theme JavaScript, filters, carts, and product forms. This article shows how to group performance issues by template and rank fixes by user impact. For more information, read our blog!