Below-Fold Lazy Loading
Checks below-the-fold images and iframes use loading="lazy".
What this check measures
We count images and iframes below the initial viewport. Each should use `loading="lazy"` to defer loading until near the viewport.
Why it matters
Lazy-loading below-the-fold cuts initial page weight 50-80% on image-heavy pages. LCP improves, data usage drops, battery life improves on mobile.
How our audit detects it
Heuristically identify below-the-fold images (based on DOM position). Check for loading="lazy" attribute.
Typical findings
- error_outlineAll 40 product thumbnails load eagerly.
- error_outlineYouTube iframe below fold without loading="lazy".
How to fix
Add `loading="lazy"` to every below-the-fold image and iframe. NEVER on the LCP element. Native support is universal in 2026.
Frequently asked questions
Lazy all images?expand_more
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LCP (Largest Contentful Paint)
Checks Largest Contentful Paint — how fast the main content appears. Target under 2.5s.
PerformanceCLS (Cumulative Layout Shift)
Checks Cumulative Layout Shift — how much the page jumps during load. Target under 0.1.
PerformanceINP (Interaction to Next Paint)
Checks Interaction to Next Paint — responsiveness to clicks/taps. Target under 200ms.
PerformanceFCP (First Contentful Paint)
Checks First Contentful Paint — when the first text or image appears. Target under 1.8s.