It's great in terms of compression (close to half size of WebP for comparable quality), but: • In countries with software patents it's illegal to use BPG witho

It's great in terms of compression (close to half size of WebP for comparable quality), but: • In countries with software patents it's illegal to use BPG without a patent license for the H.265 codec, and that patent pool is a mess. Someone needs to do BPG with AV1 payload, or just wait for browsers to finish implementing AVIF. • JavaScript adds significant latency. Browsers request native images before running any JS, so even an infinitely fast JS polyfill already starts from a losing position. On top of that, low-end devices are likely to spend more time and energy on running the JS decoder than on downloading a larger JPEG.