Implementing Fast BSS Transition (FT) for roaming is likely to cause the least impact on the application layer throughput of an 802.11n client station in a 2.4 GHz HT BSS. FT is designed to improve the efficiency of roaming between access points, but under typical usage, it does not significantly affect the application layer throughput when the client station is not in the process of roaming. On the other hand, the number of spatial streams, presence of other 802.11g clients, and interference from Bluetooth transmitters can have a more direct and substantial impact on throughput.