The Best Way to Implement Lazy Loading Images on Blogger

Google has made **Page Speed** a top-tier ranking factor. For content-heavy blogs, large image files are the number one culprit slowing down load times, leading to poor Core Web Vitals scores and, critically, **lost AdSense revenue**.

The solution is **Lazy Loading**. This simple code ensures that images below the fold (the initial visible screen) are only loaded when the user scrolls down to them. This instantly boosts initial page load speed, improves your SEO score, and enhances the user experience, especially on mobile devices.

💡 Pro Tip: Optimize Your Image Storage

While lazy loading is essential, the source of your images also matters. Storing images on a high-speed Content Delivery Network (CDN) ensures they are delivered globally at lightning speed, even before lazy loading kicks in.

👉 Check out our recommended high-speed CDN services here (Example Affiliate Link)

Why Lazy Loading is Critical for Revenue

• **Core Web Vitals Boost:** Improves metrics like Largest Contentful Paint (LCP), which directly impacts your Google search ranking.
• **Increased AdSense Fill Rate:** Faster pages mean Google's ad code loads quicker, increasing the likelihood of ads being shown and clicked.
• **Lower Bounce Rate:** Users hate slow pages. By prioritizing content loading, you keep users on your site, driving up session duration.

JavaScript Code (The Magic of Lazy Loading)

Paste this JavaScript into your theme's **</body>** section (just before the closing tag).

<script>
// Simple, Native Lazy Loading Fallback
document.addEventListener("DOMContentLoaded", function() {
    var lazyImages = [].slice.call(document.querySelectorAll("img"));

    if ("IntersectionObserver" in window) {
        let lazyImageObserver = new IntersectionObserver(function(entries, observer) {
            entries.forEach(function(entry) {
                if (entry.isIntersecting) {
                    let lazyImage = entry.target;
                    lazyImage.src = lazyImage.dataset.src; // Assuming your image has data-src
                    lazyImage.removeAttribute("data-src");
                    lazyImageObserver.unobserve(lazyImage);
                }
            });
        });

        lazyImages.forEach(function(lazyImage) {
            lazyImageObserver.observe(lazyImage);
        });
    } else {
        // Fallback for older browsers
        console.log('IntersectionObserver not supported, using standard loading.');
    }
});
</script>

How to Implement and Activate

1. **Code Insertion:** Go to **Theme (테마)** -> **Edit HTML (HTML 편집)**.
2. **Placement:** Paste the full JavaScript block just before the closing </body> tag.
3. **Image Update:** Change your image HTML tags from <img src="image.jpg" ...> to <img data-src="image.jpg" src="placeholder.gif" ...>. The script will replace the temporary placeholder.gif with the real image URL from data-src when needed.

Conclusion

Optimizing image loading is the lowest-hanging fruit for massive SEO gains. Implementing lazy loading is a critical, one-time fix that continues to pay dividends in search rankings and AdSense revenue every time a page is viewed.

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