Does Setcpu really work?

[ayryyn]

As the topic states, does Setcpu actually work? I am asking this because I tend to see more "stuttering" when it is enabled versus when it is not. For example, playing the game Guns 'n' Glory with Setcpu uninstalled, I see an occasional slowdown, but with Setcpu enabled, the game slows so much that it is almost unplayable.
Any suggestions to resolve this?

[Edit] I have two profiles. One is for when the phone is in use. This one has the sliders all the way to the left and right, respectively. It is also set to the ondemand scaling. The other is when the phone is asleep. Both sliders are set to the minimum with ondemand scaling. Any help?