@cadusilva if you tweak (by any means) details of the configuration of the host then that resource will behave "better" - at least that is usually the goal.
You may enhance CPU frequency and RAM speed by overclocking, filesystems by at least a dozen of parameters and so on. If (and only if) these resources are being used by a VM (and usually they do) then the VM guest will benefit from that tweaking.
How could it not? But actually I am unsure if there are counter-examples...