I have no idea what its doing. using pocket hack master to view low level settings:
HTC Perf. off: - cpu 312 bus 208 mem104 lcd 104/sticky engine
HTC Perf. on, either speed:- cpu 312 bus 208 mem104 lcd 104/sticky engine
So no change - but for some reason, it sure feels snappier with it on.
Chances are it just raises the bar on how fast the cpu can work. so you would only see it in a high-use time. can someone try streaming a video and then use one of the programs to clock the cpu?