I think its cool but am I the only one that doesn't really think the web is a good platform for this? Like, VM stuff needs to be as close to bare metal as possible to be fast. There's special processor features that make virtualisation work well. It's amazingly efficient now. You can vastly over-allocate your hardware between VMs with good modern virtualisation software because they're so damn efficient that they only utilise CPU and memory when they need it. That means they're not just like allocated 4 GBs if you allocate 4 GB to the VM.
All these little optimisations... just aren't going to work well in a browser. I mean, I can already see that alpine (an extremely lightweight VM that I've had boot instantly with vagrant and other such stuff) is slow here. It's a cool hack. I just prefer things to be practical...
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