HI,
Recently I conducted wireless performance test on the same platform compex 54g. The only difference was ram but lesser one was better wink
Here is my scenario (same mpci card pigtail and antenna was used by swapping the card along with pigtail)
ap 01
OS : Ikarusos
Platform : wp54g
Ram : 16mb

ap 02
OS : Openwrt 8.09 17618
Platfrom : wp54g
Ram : 32mb
distance was 15 mtrs indoors
while client connected to ikarusos ap, was rock solid with the rssi of 37-40 and the latency to ap was :
Reply from 192.168.10.251: bytes=65000 time=178ms TTL=64
Reply from 192.168.10.251: bytes=65000 time=177ms TTL=64
Reply from 192.168.10.251: bytes=65000 time=176ms TTL=64
Reply from 192.168.10.251: bytes=65000 time=176ms TTL=64
Reply from 192.168.10.251: bytes=65000 time=178ms TTL=64
Reply from 192.168.10.251: bytes=65000 time=177ms TTL=64
Reply from 192.168.10.251: bytes=65000 time=179ms TTL=64
Reply from 192.168.10.251: bytes=65000 time=178ms TTL=64
Reply from 192.168.10.251: bytes=65000 time=177ms TTL=64
Reply from 192.168.10.251: bytes=65000 time=177ms TTL=64
Reply from 192.168.10.251: bytes=65000 time=179ms TTL=64
Reply from 192.168.10.251: bytes=65000 time=174ms TTL=64
Reply from 192.168.10.251: bytes=65000 time=176ms TTL=64

while client connected to Openwrt the rssi was fluctuating from 12-40. Ping to ap was giving high latency of over 1 second and dropping of packets.

Reply from 192.168.10.1: bytes=65000 time=1359ms TTL=64
Reply from 192.168.10.1: bytes=65000 time=1899ms TTL=64
Reply from 192.168.10.1: bytes=65000 time=2014ms TTL=64
Reply from 192.168.10.1: bytes=65000 time=1734ms TTL=64
Reply from 192.168.10.1: bytes=65000 time=1528ms TTL=64
Reply from 192.168.10.1: bytes=65000 time=1383ms TTL=64
Reply from 192.168.10.1: bytes=65000 time=1076ms TTL=64
Reply from 192.168.10.1: bytes=65000 time=2556ms TTL=64
Reply from 192.168.10.1: bytes=65000 time=1943ms TTL=64

regards
norms