I just recieved my 5S yesterday and when I restored my back up, it felt so sluggish like my 5 (albeit, my 5 has been so slow for whatever reason.) I found that restoring the back up and then resetting settings (NOT content and settings) made the phone's speed like new all while being able to keep my pictures and texts, which is all I cared about. Just thought I'd let anyone know who found the UI of iOS 7 to be slow. 
