I've been searching for a faster method to compress AVIF image files, due to it's amazing ability to make such small image file sizes, as I posted earlier from large PNG files.

I've found that the libavif contains an encoder that works on the CLI that is faster than ffmpeg that I've been using.

https://github.com/AOMediaCodec/libavif

Today my test with this encoder encoded my 50Mb test images in 1sec to around 700kb, retaining great quality that would be excellent for prints.

Enjoy.