How to fix page speed warning on Adobe Commerce (Magento)

Steps for Adobe Commerce (Magento)

1. Built-in caching: In Admin → System → Cache Management, enable all cache types and click 'Flush Magento Cache'. Enable Varnish full-page cache (FPC) if your hosting supports it (System → Configuration → Advanced → System → Full Page Cache → Caching Application → Varnish).
2. JS/CSS minification: In Admin → Stores → Configuration → Advanced → Developer → JavaScript Settings, set 'Minify JavaScript Files' to Yes; under CSS Settings set 'Minify CSS Files' to Yes. Deploy static content after changes via CLI: 'php bin/magento setup:static-content:deploy'.
3. Images: Use a Magento image optimisation extension (e.g. TinyPNG for Magento, or Amasty Image Optimizer) from Adobe Marketplace. In Stores → Configuration → Catalog → Storefront, enable 'Lazy Loading for Images'.
4. CDN: In Stores → Configuration → General → Web → Base URLs (Secure), set your CDN base URL for static and media files. Fastly is included with Adobe Commerce Cloud and is configured in the Fastly extension under Stores → Configuration → Advanced → System.
5. Third-party extensions: In Admin → System → Extensions, audit installed extensions. Disable or uninstall any extension not actively in use — each can add frontend JS/CSS.
6. Verify: Run Google PageSpeed Insights and check Admin → Reports → Performance (New Relic if on Commerce Cloud) to identify remaining server-side bottlenecks.

What is page speed warning?

Page load time is how long it takes for your store's pages to fully appear in a visitor's browser. Search engines measure this as part of "page experience," and a load time above 1.5 seconds is considered slow. It's not just one thing — slow pages are usually caused by a combination of oversized images, too many scripts or stylesheets, no caching, and an underpowered hosting plan. Fixing page speed means identifying and removing those bottlenecks one by one.

Google uses Core Web Vitals (which include load speed signals like Largest Contentful Paint) as a direct ranking factor, meaning a slow store can rank lower than a faster competitor even with identical content. Every additional second of load time measurably reduces conversions — studies consistently show that a 1-second delay can cut conversion rates by 7–20%, directly costing you revenue. Slow pages also hurt mobile shoppers disproportionately, and since Google uses mobile-first indexing, poor mobile speed harms your desktop rankings too. Fixing speed is one of the highest-ROI improvements an ecommerce store can make.

See the complete Page speed warning guide for every platform and the full background.