Smashing Magazine has a great article online about some secret JPG optimization techniques. Not just “compress more” or “use OptiPNG”, but details like aligning images on 8×8-pixel boundaries and careful manipulation of colors. While the details may be too fine for most people to see, you can’t deny the impact of shrinking a frequently used image by any amount.
Clever JPEG Optimization Techniques | How-To | Smashing Magazine.
