How come though? From what I've read: While operating in bridging mode, wireless APs utilize a substantial amount of bandwidth. Wireless clients on bridged Wi-Fi networks generally share the same bandwidth as the bridge devices. Therefore, clients tend to perform slower in bridging mode than otherwise.
In Wi-Fi, repeater mode is a variation on bridging. Rather than join multiple LANs, repeater mode is intended mainly to increase the range of a single wireless LAN by extending the same wireless signal.