... but if you want something that is fast, you probably want libjpeg-turbo > When compared to baseline (the only mode that is fully accelerated in libjpeg-tur

... but if you want something that is fast, you probably want libjpeg-turbo > When compared to baseline (the only mode that is fully accelerated in libjpeg-turbo), the combination of progressive JPEG, jpgcrush, and trellis quantization improved the compression ratio by 15-27% (average 20%) in our testing but increased encoding time by approximately 34-59x. More than half of the compression ratio improvement came from the use of progressive JPEG, which is supported in libjpeg-turbo as well. Decoding time was increased by anywhere from 17% to 3x, with most of this again being due to the use of progressive JPEG.