Like with the stock launcher, Froyo couldnt improve everything.
It was the same for the Droid too. Stock launcher and unlock screen still lagged at times.
Launcher Pro helped for the launcher, I dont really know what app would for the unlock screen.
I think they shoulda left the unlock screen alone tho. It seems a lil better on the Droid and they left it alone. Its different on the X.
I mention that cuz the unlock screen is vanilla Android. It shoulda stayed the same like the Droid's.
This unlock screen, it doesnt have the dot on the right side when trying to unlock it. A long tab from the right side shows up. If u dont know what I mean, press and hold the unlock tab.