Not true, OrbStack uses Virtualization.framework: https://news.ycombinator.com/item?id=36189550

I don't think they use Virtualization for most launches now

I think you are right, I’m not sure that they actually use it for stuff that doesn’t require Rosetta (arm64 stuff)

Yes but they also use a custom linux kernel to achieve better performance than plain vz. I'm not technical enough to tell if it's bs, but it boots subsecond

OrbStack is great but it is solving a different problem. it's a full Docker Desktop replacement. shuru is just a thin layer over Virtualization.framework for spinning up throwaway sandboxes.

OrbStack has some invasive elements inside it trying to provide filesystem integration, and the filesystem they use is not POSIX compliant and causes breakage with some build systems and other software.