Do you use a 5 GHz network? What exact computer with what exact WiFi capabilities do you use to connect to the AEBS? And how far is the AEBS away from the computer and how many walls (thickness perhaps?) are between them?
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Only the Macbook Pro, when connected on the 5GHz band and in the same room, will be able to hit 150mbps speediest. Have you verified it is connected in 5GHz mode?
DFS is an FCC regulated power limiting mode to avoid interference with RADAR.
1. Switch to channel 149+. Somewhere in airport app advanced wireless you can specify manual channel.
2. Make sure you are in the same room as your access point.