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2026-07-13Performance

How to improve Core Web Vitals on Adobe Commerce in 2026


Why Core Web Vitals are crucial in 2026


Since 2021, Google has used Core Web Vitals (CWV) as a ranking factor. In 2026, their importance has only grown. With INP (Interaction to Next Paint) replacing FID, performance requirements are stricter than ever.


A poorly optimized Adobe Commerce site can see its organic traffic drop by 30% simply due to bad CWV scores.


The three metrics to master


LCP (Largest Contentful Paint) — Target: < 2.5s


The largest element loading on your page (often a hero image or text block). On Adobe Commerce:


  • **Optimize your images**: use WebP/AVIF format, implement native lazy loading
  • **Critical CSS**: inline CSS above the fold
  • **Serve from the edge**: use Fastly CDN to serve static assets
  • **Eliminate blocking JavaScript**: defer or async

INP (Interaction to Next Paint) — Target: < 200ms


INP measures your site's responsiveness to user interactions (clicks, taps). On Adobe Commerce:


  • **Reduce long JavaScript tasks**: split JS into async chunks
  • **Optimize event handlers**: avoid overly complex listeners
  • **Use Web Workers** for heavy computations
  • **Prioritize script loading**: load visible content first

CLS (Cumulative Layout Shift) — Target: < 0.1


CLS measures the visual stability of your page. Nothing is more frustrating than a page that shifts during loading.


  • **Reserve space for images**: use explicit width/height attributes
  • **Avoid dynamic insertions**: banners, popups, and ads must have reserved space
  • **Preload fonts**: avoid flash of invisible text (FOIT)

Tools to measure your CWV on Adobe Commerce


  • **PageSpeed Insights**: the Google reference
  • **Lighthouse**: integrated in Chrome DevTools
  • **New Relic**: included with Adobe Commerce Cloud, excellent for continuous monitoring
  • **Fastly Observatory**: to analyze CDN performance

5-step action plan


  • **Audit** your current CWV scores with PageSpeed Insights

2. **Identify** the most critical pages (homepage, categories, product pages)

3. **Fix** LCP issues first (images, critical CSS, hosting)

4. **Optimize** INP by lightening your JavaScript

5. **Stabilize** CLS by reserving space for all elements


Every millisecond counts. I can help you audit and optimize your Core Web Vitals on Adobe Commerce. Let's discuss your project.

I can help you.

Let's discuss your project.