As far as memory goes your OS would normally gobble up as much ram as it can get for caching. You would have to go out of your way to make it memory-frugal so i

As far as memory goes your OS would normally gobble up as much ram as it can get for caching. You would have to go out of your way to make it memory-frugal so it could yield ram back to the hypervisor, and that could impact performance. It's easier with CPUs where you can just yield back if there's no work.