Sorry kano, had some orthographic mistaces in it that made it confusing i guess.
Typed some things different now in hope to make my point more clear.

For those still not getting it:

The client will be the one telling you how many Mhash/s you are mining. So he will just be displaying a higher value than what he actually does.
Sure its not faster, but who realy checkes how many results realy be done, most people just check the displayed xxx Mhash/s. And there the hashs client claims to be done will be way higher for the CPUs than what they realy achive.

hope it's clear now