Images play a massive role in modern web development today. They comprise of around 62% of the average page's total payload, which is an astonishing amount! In terms of web page performance, images are a huge performance roadblock. However, they don't have to be. Simple optimization techniques can make a massive difference and significantly reduce the overall weight of your page.
View the example site at imageoptimization.info
(C) Robin Osborne & Dean Hume 2014, released under the MIT license