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Orbstack also uses a virtual machine.

How does it work? Why is it fast?

OrbStack uses a lightweight Linux virtual machine with tightly-integrated, purpose-built services and networking written in a mix of Swift, Go, Rust, and C. See Architecture for more details.

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It's using Apple Virtualization Framework + Rosetta acceleration instead of third party hypervisor like QEMU. There are ways to do this via the CLI with a simple one line command if you have Xcode installed.

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