10 Shopify Performance Optimizations That Actually Increase Conversions

Page speed isn't just a technical metric — it's a revenue driver. Every 100ms of delay can reduce conversions by up to 7%. Here are the ten optimizations ShopStack implements on every store we build.

1. Optimize Images with Modern Formats

Convert hero and product images to WebP/AVIF, implement lazy loading, and use Shopify's native image CDN with appropriate size parameters. This alone can cut page weight by 40–60%.

2. Audit Liquid Template Performance

Reduce nested loops, minimize render-blocking sections, and defer non-critical JavaScript. Our team profiles every theme before launch to eliminate bottlenecks.

{%- comment -%} Use image_url filter with width param {%- endcomment -%}
{{ product.featured_image | image_url: width: 800 | image_tag: loading: 'lazy' }}