---
title: "Shopify Migration Image Weight: Up to 1.3MB Lighter - PageSpeed Matters"
url: https://www.pagespeedmatters.com/resources/data-studies/shopify-migration-image-weight
description: "Median homepage image weight fell after every common ecommerce move to Shopify, from 307 KB lighter for stores leaving WooCommerce to 1,330 KB lighter for stores leaving BigCommerce, but added JavaScript meant most stores still got heavier overall."
lang: en
---

Shopify Migration Image Weight: Up to 1.3MB Lighter (https://www.pagespeedmatters.com/resources/data-studies/shopify-migration-image-weight)

Median homepage image weight fell after every common ecommerce move to Shopify, from 307 KB lighter for stores leaving WooCommerce to 1,330 KB lighter for stores leaving BigCommerce, but added JavaScript meant most stores still got heavier overall.

Median image vs JavaScript change after moving to Shopify (KB)

BigCommerce images -1,330 KB

BigCommerce JS 890 KB

PrestaShop images -1,206 KB

PrestaShop JS 790 KB

Salesforce Commerce Cloud images -730 KB

Salesforce Commerce Cloud JS 802 KB

Magento images -628 KB

Magento JS 519 KB

WooCommerce images -307 KB

WooCommerce JS 875 KB

Source: PageSpeed Matters. HTTP Archive top 1M monthly crawls, Sept 2024 to Sept 2026, medians per site.

Negative values are image weight cuts; redesigns are included, so Shopify alone is not the cause.

Source: Shopify Migration Image Weight: Up to 1.3MB Lighter - PageSpeed Matters (https://www.pagespeedmatters.com/resources/data-studies/shopify-migration-image-weight)