After I upgraded to 3.0, I felt the phone was slower than before.
But today I realized that the reason that I felt it's slower is that sometimes when I quit an app, there is no animation.
Normally when you quit an app (i.e. by pressing the home button), you should see the app shrinking and all the app icons on the springboard moving into place.
But now, after I press the home button, I will, sometimes, see the app being frozen for 1 second and then the home screen will come up immediately after that without animation at all.
This gives me an impression that the phone is slower.
However, the thing is that it doesn't always behave like this.
If I tap an app and quit immediately after it finishes loading, it seems to be fine.
But if I use the app for some time, it may quit without animation.

I jailbroke with Redsn0w and is using Winterboard. I tried disabling everything in Winterboard, but it doesn't help. Is anybody seeing the same problem?

i have the same problem too
please contact me if u know the solution on e_mine_m@msn.com

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Did you upgrade to 3.0 or restore and set up as a new phone?
Did you restore from a backup made in FW2.xx?

yes i guess i restored from 2.0

I've noticed the same problem you have for a while, and I can tell you it's WinterBoard.

I guess even with nothing enabled, WinterBoard still uses a significant amount of memory, slowing down system performance.

Once I uninstalled WinterBoard, the problem's gone, and my iPhone is fast again (shows all the animations for opening/quitting). Now it's time to decide whether my BlackBerry Storm Click and invisible dock is worth sacrificing for system performance

Now you know there's a reason to upgrade the processor and RAM in the 3GS