Based on benchmarks[1], CachyOS is slightly faster than other distros, only behind Clear Linux (RIP), but I would be extremely curious to see why this would warrant a whole who distro being created. These optimizations can (and probably will) be upstreamed into Arch Linux at some point in the future. Compiler optimizations are one thing, but enabling newer instruction sets doesn't improve performance sans some very specific workloads. This all seems like marketing hype to me with very little substance.
[1] https://www.phoronix.com/review/cachyos-linux-perf