I'd love to see a comparison of the computational expense of avif compared to webp. I know av1, which avif is based off, is pretty hard on the hardware.
See various charts. For example, this table:
https://res.cloudinary.com/cloudinary-marketing/images/f_aut...
For decoding,
Webp - ~70Mpx/s,
jpeg - 100 to 300 Mpx/s
Jpeg xl - 115 to 163
Avif (single thread) - 32 to 37
Avif (multithread) - 90 to 110