It is also first in the Distrowatch rank
https://distrowatch.com/table.php?distribution=cachyos
I distro hopped to it from Bazzite a couple of months ago, and I could not be happier.
If you try the installer, be careful when selecting multiples DE/WM as the conflicts were not listed anywhere for the installation process.
Picking a single environment and then adding the others later was what worked for me.
Only different config, since it’s based on arch.
They have their own pacman-mirror, pacman is set up to download a lot more in parallel and they set the scheduler formerly known as “cachy”, which is supposedly really good for a snappy UX.
It’s a lot more than that. It doesn’t fork Arch like Manjaro, but they have tons of custom and extremely convenient and useful packages in their repos. It’s also a living “optimization experiment” in the vein of Intel’s Clear Linux (may it rest in peace).
Theoretically, you could replicate it in vanilla arch, but I can’t imagine how many man-hours it would take.