They are little bit slower because of much things to load, for example more icons in app drawer or more widget in the home screen, I didn't noticed that launching an app.....
If you're referring to this launcher there are several adjustments to do having full source code, but working with smali takes too much time that in this moment I don't have.
So, this launcher have some potentials, but without sources is difficult.....
To edit the dock size you must work with some XML....;)
Inviato dal mio GT-I9300 con Tapatalk 2