Currently playing around with virtualisation, and most of my virtual machines eat ram like candy but will barely touch cpu cores.
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It just depends on what is actually happening inside the VM. If you run a virtual render farm with 3D rendering cranking away inside every guest, the host CPU will get pegged. If you just fire up a VM and don’t actually have any activity running, it won’t consume significant CPU time. Pretty much the same as any software, really.
Open up something more mundane than VM software, like Microsoft Excel, and it’ll just sit there using RAM. Recalculate every cell if a giant spreadsheet with complex expressions, and it will peg the CPU.
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