Maybe you don't want to root your phone. That is ok. You can try to fix it by getting from the android Market ADW Launcher. I use it all the time.We upgraded my wife's phone with the BestBuy deal last night for free. She is still getting used to Android and having such a sensitive touch screen. It has 2.2.1 on it and i noticed how much more responsive it is then mine, which i bought the first day it went on sale, and also has 2.2.1. Hers doesn't have the keyboard rotate delay or wifi errors. I guess thats what a nice new clean froyo is like.
Hopefully gingerbread fixes my issues.