Image optimization

A set of techniques designed to reduce the size of image files without compromising their visual quality, in order to improve the loading speed of web pages. This includes compression, resizing, lazy loading and the use of modern formats such as WebP or AVIF.

Impact on CRO and conversions

Image optimization is crucial to improving user experience and business performance. A study carried out by Google and Deloitte revealed that an improvement of just 0.1 seconds in mobile page loading time could increase conversion rates by 8.4% for e-commerce sites and 10.1% for travel sites.Google Business+1nitropack.io+1

Recommended techniques

• Compression: Use tools such as ImageOptim, Squoosh or TinyPNG to reduce image size without significant loss of quality.
• Resizing: Adapt image dimensions to actual display requirements to avoid loading unnecessarily large files.
• Modern formats: Use formats such as WebP or AVIF, which offer better compression than traditional JPEG or PNG formats.
• Lazy loading: Load images only when they are about to be displayed on screen, reducing the initial page load time.
• Content Distribution Networks (CDNs): Use services like Cloudinary or Imgix to optimize and distribute images efficiently on a global scale.

Direct benefits

• Reduced page load times, improving the user experience.
• Reduced bounce rate, as users are less inclined to leave a page that loads quickly.
• Improved conversion rates, as demonstrated by the studies mentioned.
• Better performance in terms of natural referencing, as Google takes loading speed into account in its ranking criteria.

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