Image file too large
Images are usually the heaviest part of a page. An oversized file slows everything and raises bandwidth and emissions.
What it is
This check flags images whose file size exceeds a sensible threshold, often uncompressed PNGs or full-resolution photos.
Why it matters for SEO
Heavy images inflate page weight and Largest Contentful Paint, hurting Core Web Vitals and mobile rankings.
Example
hero.png - 4.2 MB (uncompressed)
How to fix
- Compress images and export at the dimensions actually displayed.
- Serve modern formats (WebP/AVIF) with fallbacks.
- Use responsive
srcsetandloading='lazy'below the fold. - Re-crawl to confirm image weights dropped.