Image optimization

A set of techniques aimed at reducing image file size without compromising visual quality, in order to improve web page loading speed. 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 for improving user experience and business performance. A study conducted by Google and Deloitte revealed that an improvement of just 0.1 seconds in mobile page loading time could lead to a conversion rate increase of 8.4% for e-commerce sites and 10.1% for travel sites. ​Google Business+1nitropack.io+1

Recommended techniques

• Compression: Using tools such as ImageOptim, Squoosh, or TinyPNG to reduce image size without significant loss of quality.
• Resizing: Adapting image dimensions according to actual display needs to avoid loading unnecessarily large files.
• Modern formats: Using formats such as WebP or AVIF, which offer better compression than traditional JPEG or PNG formats.
• Lazy loading: Loading images only when they are about to be displayed on screen, thereby reducing the initial page loading time.
• Content delivery networks (CDN): Using services such as Cloudinary or Imgix to optimize and distribute images efficiently on a global scale.​

Direct benefits

• Reduced page loading time, thereby improving user experience.
• Lower bounce rate, as users are less likely to leave a page that loads quickly.
• Improved conversion rates, as demonstrated by the studies mentioned.
• Better organic search performance, as Google takes loading speed into account in its ranking criteria.