How to fix slow page on Adobe Commerce (Magento)

Steps for Adobe Commerce (Magento)

1. In the Admin panel go to Stores → Configuration → Advanced → Developer → JavaScript Settings — set 'Merge JavaScript Files', 'Minify JavaScript Files' to Yes.
2. Go to Stores → Configuration → Advanced → Developer → CSS Settings — set 'Merge CSS Files' and 'Minify CSS Files' to Yes.
3. Go to Stores → Configuration → Advanced → System → Full Page Cache — enable Varnish Cache (recommended) or the built-in Magento FPC.
4. Images: Go to Stores → Configuration → General → Web → and enable WebP image conversion if your theme/extension supports it. Use an image optimisation extension (e.g., 'Magento Image Optimizer' from the Marketplace) to bulk-compress the media gallery.
5. Enable Magento's built-in lazy loading for catalog images in your theme's XML layout files, or install a performance extension such as 'Mageworx Lazy Load'.
6. At the server level (requires developer/sysadmin): enable OPcache, GZIP/Brotli compression, HTTP/2, and deploy a CDN (Fastly is bundled with Adobe Commerce Cloud; on-premise installs should configure Cloudflare or Cloudfront).

What is slow page?

Page load time is how long it takes for a visitor's browser to fully display your store page. When a page takes longer than about 3 seconds, visitors tend to leave before they even see your products — a behaviour called "bouncing." Google also directly measures loading speed as part of its Core Web Vitals scoring system, which feeds into how high your pages rank in search results. A load time of nearly 10 seconds (like the example above) is extremely slow and will hurt both rankings and sales.

Google uses Core Web Vitals — which include Largest Contentful Paint (LCP), a direct measure of loading speed — as a confirmed ranking signal. Pages that load slowly rank lower in search results, meaning fewer shoppers find you organically. Research consistently shows that every additional second of load time reduces conversion rates by roughly 4–7 %, so a 10-second page can cost you a significant share of potential sales. Slow pages also create a poor first impression, increase bounce rates, and can disqualify your pages from Google's "Page Experience" enhancements in search results. On mobile — where Google primarily indexes your site — performance issues are amplified further.

See the complete Slow page guide for every platform and the full background.