Do you remember what you dreamed about 7 years ago? An Ampere Altra 80-core-CPU was sold for less than 210€ on eBay in January.

Oh, nice! I always wanted one of those, a many-core build server running ARM would be excellent for Yocto. Anything running in quemu in the rootfs is so slow on x86 and I've seen the rootfs postprocess step take a long time.

Though... these days, getting enough RAM to support builds across 80 cores would be twice the price of the whole rest of the system I'm guessing.