Mobile-First Image Optimization: Complete Guide for 2024

Master mobile-first image optimization techniques to deliver fast-loading, high-quality images on mobile devices.

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1. Adaptive Loading Strategies

Implementation Example

<picture>
  <source
    media="(max-width: 640px)"
    srcset="image-small.webp"
    type="image/webp">
  <source
    media="(max-width: 640px)"
    srcset="image-small.jpg">
  <img src="image-fallback.jpg" alt="Responsive image"
    loading="lazy"
    decoding="async">
</picture>

2. Mobile Performance Metrics

3. Bandwidth Optimization

Best Practices

  • Progressive loading
  • Compressed thumbnails
  • Network-aware loading
  • Cache optimization

4. Modern Image Formats

Format Selection Script

const checkWebpSupport = async () => {
  const webP = new Image();
  webP.src = 'data:image/webp;base64,...';
  return new Promise((resolve) => {
    webP.onload = () => resolve(true);
    webP.onerror = () => resolve(false);
  });
};

5. Dynamic Resource Loading

Connection-Aware Loading

if (navigator.connection) {
  const connection = navigator.connection;
  if (connection.saveData) {
    // Load low-resolution images
  } else if (connection.effectiveType === '4g') {
    // Load high-resolution images
  }
}

6. Performance Monitoring