Well when it comes to your home screens there are some stuff that can affect the smoothness. If you had a lot of widgets and/or you're running a live wallpaper, things can definitely slow down. When it comes to the live wallpaper though, it can also depend on what live wallpaper you're using. I can use the Grass live wallpaper and things will be smooth. But if I use the City At Night wallpaper I notice things start to slow down. Just for the record, I have about 11 widgets up lol....