[beagle3]

How are the compression and decompression speeds compared to e.g. turbojpeg?

Is there a poly fill js/warm decoder for older browsers?

[tomhanlon]

Not sure on the compression/decompression speeds.

There is a polyfill for old browsers but our recommendation would be to use the graceful degradation of the <picture> tag which falls back to <img> if .avif or .webp is not supported.