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How can I optimize lazy loading images for better performance in a React app?

Asked on Dec 31, 2025

Answer

Optimizing lazy loading of images in a React app can significantly enhance performance by deferring the loading of off-screen images until they are needed. This approach reduces initial load time and improves user experience, especially on pages with many images.
<!-- BEGIN COPY / PASTE -->
    import React, { useState, useEffect } from 'react';

    const LazyImage = ({ src, alt }) => {
      const [isVisible, setIsVisible] = useState(false);
      const imgRef = React.useRef();

      useEffect(() => {
        const observer = new IntersectionObserver(
          ([entry]) => {
            if (entry.isIntersecting) {
              setIsVisible(true);
              observer.disconnect();
            }
          },
          { threshold: 0.1 }
        );

        if (imgRef.current) {
          observer.observe(imgRef.current);
        }

        return () => {
          if (imgRef.current) {
            observer.unobserve(imgRef.current);
          }
        };
      }, [imgRef]);

      return (
        <img
          ref={imgRef}
          src={isVisible ? src : ''}
          alt={alt}
          loading="lazy"
          style={{ minHeight: '200px', minWidth: '200px' }}
        />
      );
    };

    export default LazyImage;
    <!-- END COPY / PASTE -->
Additional Comment:
  • Use the `IntersectionObserver` API to detect when an image enters the viewport.
  • Set the `loading="lazy"` attribute as a fallback for browsers that support native lazy loading.
  • Ensure images have a defined size to prevent layout shifts during loading.
  • Consider using a placeholder or a low-resolution image while the main image loads.
  • Test across different devices and network conditions to ensure consistent performance.
✅ Answered with Web Development best practices.

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