Images are usually the heaviest assets on a CMS website. One uncompressed hero image can undo hours of careful CSS and JavaScript optimization.
The solution is not to avoid images. It is to prepare and serve them correctly.
Use modern formats
WebP is supported broadly and usually delivers smaller files than JPEG or PNG. AVIF can be even smaller, though support and tooling vary by platform.
Resize before upload
A 4000px photo should not be uploaded if the design only displays it at 1200px. CMS image resizing helps, but starting with sensible source dimensions reduces storage and processing overhead.
Treat the hero image differently
The hero image is often above the fold and should load early. Do not lazy-load the LCP image. Preload it or mark it as high priority when your framework supports it.
Lazy-load below the fold
Gallery images, blog thumbnails lower on the page, and decorative sections should load only when needed. This reduces initial page weight.
Keep dimensions explicit
Always reserve space with width, height, or aspect-ratio. This prevents layout shift and improves Core Web Vitals.
Image optimization is one of the fastest ways to improve real user experience on a CMS site.
Images are often the biggest performance problem on CMS sites. This guide covers formats, dimensions, lazy loading, hero images, and compression workflows.
- Abdullah Sajid
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