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There is a claim that "progressively loading images tend to degrade the overall user experience of a web application", but even if I accept that at face value (which I don't), I find it strange that they'd compare baseline JPEG loading instead of the progressive JPEG loading (you'd mostly want this for large files, thus mostly photographs, thus JPEG :).

I would argue that progressive JPEGs are more "graceful" than spinning gifs.

That actually reminds me of the image preloaders we had in the late 90s/early 00s with JS ;-)