5 Tips to Optimize Your Images the Right Way

Here are some links to help you:
1. Resizing images per container

2. Google for CDN of your choice

3. Image optimization tools (compression)

4. Cache-Control headers

5. Use better image formats depending on the browser

[_rajenderjoshi]

Pagespeed module does that - WebP for Chrome and PNG/JPEG for other browsers. :)

[LourensRolograaf]

if you have an image with half the width and half the height it is a quarter of the surface of the original, not half!