The "VM-isolated sandbox" is apparently not referring to the JavaScript VM but to a hypervisor, according to the text a bit further down on the page. I wouldn't expect that to be particularly fast or efficient, especially not if you're already running in a VM and have to use nested virtualization (if it's even available).

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theMackabu 6 hours ago | parent [-]

its pretty fast tbh, though third-party benches would be great to have!

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ptx 6 hours ago | parent [-]

Is it essentially implementing a paravirtualized OS that runs the JS runtime? Presumably you have to allocate the memory for the VM up front, or how does that work?

	▲	theMackabu 6 hours ago \| parent [-]
		on linux its kvm, on darwin its hypervisor.framework, the memory is not upfront, by default 256mb is lazy allocated, and ~35mb are used by both ant + the vm. the kernel is https://nanos.org with patches to get ant+networking running smoothly