I believe different people will have differing perceptions of what is "lag" to them. Eg, someone may not even tolerate 1 sec of black screen when transitioning between task while to someone else even 2 seconds may be acceptable.
My previous phone was a Winmo, HTC Diamond2. Scrolling the screen was painfully slow, opening a different app takes 3 seconds or more. The "spinning globe" thingy became my best friend
So you can imagine coming to SGS, it was like day and night, and so I was wondering what all the fuss is about "laggy"! Sure, there were times when opening an app, say Market or Handcent, there's maybe 1 second of the black screen when the app starts...but to me, it wasn't anything to complain about.
That was until I got my hands on my friend's Desire. The scrolling was smooth...switching Live wallpapers were less than a sec, opening Settings just jumped at me. Only in comparison did the SGS "felt" slower.
So I went to Modaco, xda etc to look for a "cure". Currently quite happy with Mimocan's fix. Not sure about the longterm effects yet though.
Like they say, sometimes ignorance is bliss
