Looks like the move from 3G to 4G also meant going from "real speeds are 1/5th of theoretical max" to "real speeds are 1/10th of theoretical max". I wonder if that's due to congestion at the phone-to-tower level, congestion at the tower-to-internet level, or due to newer wireless tech just having higher peak performance at optimal physical conditions (e.g. line of sight) that are becoming increasingly hard to actually accomplish in practice?