Image Optimization: 10 Best Tactics to Boost Your Rankings Fast

Images are often the largest assets on a WordPress page. Optimizing them improves load time, Core Web Vitals, accessibility, and the experience of visitors on mobile connections.

Ten tactics

1. Resize images to the largest rendered width before uploading.
2. Use AVIF or WebP when your browser and delivery pipeline support them.
3. Compress images with a quality level appropriate to the subject.
4. Write descriptive alt text and leave decorative images empty.
5. Keep filenames meaningful before the upload reaches the Media Library.
6. Set explicit width and height to prevent layout shift.
7. Use responsive srcset and sizes attributes.
8. Lazy-load images below the fold, but not the primary hero image.
9. Preload only the image that is truly critical to the first view.
10. Remove unused image sizes and audit old media periodically.

The fastest image is the one that is correctly sized, correctly prioritized, and never downloaded when the visitor cannot see it.