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You don't even need to do this: qemu support for executing arm64 binaries is fairly good, so you can just run the builds on your beefy x86 server anyways.

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What's the single thread performance difference of a fast x86 cpu running emulated ARM code vs a fast ARM server or an AWS ARM instance?

It's quite fast if you use qemu-user.

qemu-user just gets you native speed sustem calls right? That's normally <10% of execution time so it can't be a very big help.

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