I don't use either much these days but something has puzzled me. People recommend kvm > vbox most of the time. Yet in my experience i can't get near the performance (when testing gui stuff) that Virtuabox can give me. Guest additions alone make it a whole new machine so to speak. Is there a guide somewhere that advises how to make full use of kvm for gui stuff or is passthrough pretty much a requirement for gpu stuff?
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