Progressive decoding: JPEG vs JPEG XL vs AVIF
Example of what loading a big image over a slow connection would look like.
Download speed here is 30 kB/s, more or less what you get on 2.75G (EDGE).
This is a 5 megapixel image, encoded to roughly the same perceptual quality using 4 different codecs:
libjpeg-turbo (default sequential mode)
mozjpeg 4.0.1 (default progressive mode)
JPEG XL 0.1
AVIF (libavif 0.8.2 / libaom 2.0.0)
See also • Progressive decoding: JPEG vs JPEG XL vs FLIF for a comparison to FLIF and to see JPEG XL's "LQIP mode" decoding.