May be superman always consider to be physically well and hence No superman does good... 
Still I would say, I am doing good, since i referred rather to emotional state than physical state and For sure I am not a superman
I agree to your points, that may be role itself may not be enough to compare performance and it different tcodes behaves differently....
I just wanted to ensure that if it is exactly a security design issue which is causing this performance or something else... May be it can load balancing or encryption or any other issue which is actually causing this performance issue...
Asheesh, do let us know if you got any further updates with this...