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QEMU looks interesting. I have a few questions about its intended use case.

1. My understanding is that the primary use case of QEMU is for server virtualization on Linux hosts leveraging KVM. Is there a use-case for QEMU on non-Linux hosts?

2. I have read that QEMU excels in server virtualization but lags behind VirtualBox in desktop virtualization. Is this still the case? [1]

3. Is it considered "slow" for cross-architecture virtualization? [1]

[1] http://superuser.com/questions/447293/does-qemus-performance...