What are the recommended image optimization techniques in Magento?

@dortha 

1. Use optimized image formats such as JPEG, GIF, and PNG.
2. Use alt tags to describe the image to search engines and visually impaired users.
3. Use descriptive file names that describe the image and contain keywords.
4. Reduce the size of your images before uploading by compressing them without compromising their quality.
5. Use external caching mechanisms like CDN to deliver images from high-speed servers.
6. Use lazy loading to only load images when they’re needed, optimizing load speed.
7. Use CSS sprites to reduce the number of requests sent to the server.
8. Optimize thumbnails by creating them ahead of time to avoid slowing down page load times.
9. Use responsive design to ensure images display correctly on a variety of devices.
10. Consider design elements, such as background colors and text placement, when optimizing images for Magento's theme.