Sindar is having trouble with his Samsung Galaxy Note II running slow. Leo says that it's always a good idea to delete everything, and do a factory reset to see if that helps. Also, the more apps he has, the less storage he'll have available, and it will slow down more. The older a smartphone gets, the more worn the SSD gets, and the slower it becomes. That's why modern Android phones use a utilty called "Trim." It also may help to go with Android 4.3, because that provides Trim support.