There's a fellow on Fedora forums, who did some casual benchmarking of VBox vs. kvm.
He found that KVM was actually a bit ahead of native in raw computer and VBox a bit behind. (By raw computing, I've forgotten what he used to test, but some sort of number crunching, I think.) Using Native as 100, KVM (on a machine with a VT enabled processor) was something like .99 and VBox about 100.01 or so.
Phoenix and myself have expressed our opinions of 2.0 and they pretty much agreed with the link provided S0xxx. Judging from their forums, it seems that most people seem to agree that 2.0 is a regression.
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