Progressive JPEG performance optimization

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Empirical compression efficiency analysis of jpegtran & jpegrescan

A side by side comparison of how to efficiently compress lossless progressive JPEGs in the light of progressive JPEGs being a better pick for UX & their advantages on mobile connections, the fact that WebPagetest now urges you to deliver progressive JPEGs because only ~7% of all JPEGs on the web are progressive and image bytesize being The New Black in the context of responsive images.