There are new Intel instructions (GFNI) which accelerate things a lot, as well as various hacks to make it go fast. See https://www.reddit.com/r/ceph/comments/17z1w08/but_is_my_cpu... for some quick and dirty benchmarks on jerasure, one of the EC plugins for Ceph, IIRC not using GFNI. (TLDR: 25GB/s on a Ryzen 7700X)