[cmurf]

Fedora 31 switched RPM to use zstd. https://fedoraproject.org/wiki/Changes/Switch_RPMs_to_zstd_c...

Package installations are quite a bit faster, and while I don't have any numbers I expect that the ISO image compose times are faster, since it performs an installation from RPM to create each of the images.

Hopefully in the near future the squashfs image on those ISOs will use zstd, not only for the client side speed boost for boot and install, but it cuts the CPU hit for lzma decompression by a lot (more than 50%). https://pagure.io/releng/issue/8581