Core Web Vitals experiments, render-path analysis and app-contention measurements on production Shopify themes.
Understand why Shopify Lighthouse lab scores and real-user Core Web Vitals can disagree, and how to interpret both without confusing diagnostic scores with customer experience.
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.
