I was wondering why and how come my 5800 has become pretty responsive and somehow fast in general and specific tasks after i updated it to v20.0.12 some times ago (now i'm on v31.0.008 of course)...

Well, while i was surfing through nokia forum today, i came across to this detail that the CPU clock rate was upgraded from device sw version 20.0.012 onwards !

Guess what, you have already an overclocked 5800 with the same clock rate as the other Nokia's symbian touchscreen devices (N97, X6, 5530, 5230 and N97 mini) ! :p