"Progressive" JPEG: Why do many web sites avoid rendering JPEGs that way? Pros, cons?

Posted by Chris W. Rea on Pro Webmasters See other posts from Pro Webmasters or by Chris W. Rea
Published on 2010-07-09T20:10:30Z Indexed on 2012/09/04 15:55 UTC
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When JPEG images are used by a web page, they are typically rendered top-down ... but they can also be rendered using a mode called progressive JPEG, where the image starts out full-size, but blurry, and then gets sharper with successive passes, until it's fully loaded. Progressive loading requires the image have been saved that way.

Why don't more web sites use progressive JPEG? What are the drawbacks? Is it simply a lack of tool support, or are these files somehow inferior to traditional top-down rendered JPEG images?

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