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UTM runs virtual machines on iOS and has been around a while: https://getutm.app

Issue is that Apple doesn’t allow apps to run JIT so if you want the JIT version of UTM, you need to sideload or Jailbreak. The non-JIT version is on the App Store.

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Are there any OSes that have usable performance (<1min to boot) on iOS without JIT? I tried a few and they were impractically slow.

What’s the performance penalty for the non JIT version?

Reviews on the App Store say very slow and you can’t move windows without waiting minutes. A Linux distro that’s CLI only seems to work.

I've tried the non JIT version, and while it's cool that something like this even works, it's not actually usable. It's very, very slow for anything graphical. You might be able to get away with just running a terminal.

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