Cisco Wireless :: Experiencing A Big Speed Decrease Using AP541 As Repeater With WDS

We have a WDS connection between two AP541 access points, where one AP is connected to a SA540 with cable. The AP in the other end of the WDS does just act as a repeater, broadcasting using the same SSID and channel with WPA-PSK, as the cabled AP. For the WDS channel, we have tried WPA/WEP/none encryption without any difference. Spanning tree is enabled. 802.11 mode is 'bgn'.
 
Sitting physically beside the remote AP (the "other" and uncabled end of WDS) with a laptop using Intel 802.11bg adapter, we get a speed in the range 5-7Mbit/sec connecting to the cabled AP (3 of 5 bars signal strength in the traybar icon on Win7). But switching to the remote AP, which is beeing feed by the WDS from the same cabled AP previously being connected to, we do just get a measured bandwidth of 1-2Mbit/sec. I understand that some throughput is lost using WDS, but this does still look like a big decrease?Any experience using WDS with AP541, who can comment on if this is expected or not, and eventually any thing we can do to increase the speed?