"Just serve progressive JPEGs" is one of those tips that gets repeated without numbers. I work on the on-device codec side of an image tool, so I sat down and measured both halves of the trade on the same two images: how many bytes progressive saves, and how much extra time the decoder spends to...
Source: [Dev.to](https://dev.to/pm_cheng_3f36acecfb9c59f5/progressive-jpeg-saved-4-6-of-bytes-and-cost-25x-decode-time-g8c)