The App Problem
Shopify merchants love installing apps. Every app injects heavy JavaScript into your theme. Audit your apps and delete what you don't absolutely need. Remove the residual code from your theme.liquid file.
Image Optimization
Never upload a massive PNG for a product image. Convert to WebP and ensure lazy-loading is enabled for all images below the fold.
Headless Commerce
For ultimate speed, brands migrate to Headless builds (connecting Shopify backend to a Next.js frontend). This guarantees instant load times and perfect Core Web Vitals.