JPG, PNG and GIF are the three image formats that websites use for their images. We decided to find out exactly how common each format is, and how large the images of each format tend to be. After analyzing more than 23 million images, we have found some very interesting results.

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Aptimize has released a product called Runtime Page Optimizer. The software runs on your webserver and applies performance optimizations to pages before they are delivered to the browser.

Aptimize uses many of the optimizations that Steve Souders describes in his book High Performance Web Sites and the best practices from YSlow.

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