Core Web Vitals experiments, render-path analysis and app-contention measurements on production Shopify themes.
When a Shopify storefront feels sluggish after it has loaded, the problem is often not download size but the work triggered by clicks, taps, typing and DOM updates.
Apps are often blamed for Shopify performance regressions, but the useful question is which network, main-thread, DOM or rendering cost actually changed.
Why Shopify hero images, animations, JavaScript rendering and third-party code repeatedly turn into LCP problems—and what we check first.
