Progressive use is up since mozjpeg and some other tools (CDNs perhaps?) started defaulting to it. My guesswork is that during the last eight years of format de

Progressive use is up since mozjpeg and some other tools (CDNs perhaps?) started defaulting to it. My guesswork is that during the last eight years of format development the biggest winner is progressive JPEG (from 8 % to 25 % of JPEG use). The 'green men' problem and interpolation of progressive JPEG have been fixed recently.