Vista & OSX wifi performance on MacBook Pro

MacBook Pro 2.4Ghz, 4Gb ram, OSX 10.5.2, Airport Extreme 802.11n, Airport Express 802.11n extending network
Noticing dreadful wifi performance while running OSX (trace below) compared to performance when runing Vista (Bootcamp) on the same laptop. In both traces I'm pinging the DNS server for the connection. As a result web browsing in OSX is awful compared to Vista. Signal strength is also much better under Vista (96%) than OSX (56%) I'm 4 feet from the Airport Express which extends the Extreme BS in another room.
Any idea what could be causing this ? This has been going on for a while to the extent I had the Airport card replaced under warranty today. Presumably ths must be an OSX issue as dual-booting into Vista effectively rules out hardware isues.
Apple OSX 10.5.2
PING 212.23.3.100 (212.23.3.100): 56 data bytes
64 bytes from 212.23.3.100: icmp_seq=0 ttl=58 time=516.876 ms
64 bytes from 212.23.3.100: icmp_seq=1 ttl=58 time=233.578 ms
64 bytes from 212.23.3.100: icmp_seq=4 ttl=58 time=1420.669 ms
64 bytes from 212.23.3.100: icmp_seq=5 ttl=58 time=420.449 ms
64 bytes from 212.23.3.100: icmp_seq=6 ttl=58 time=29.720 ms
64 bytes from 212.23.3.100: icmp_seq=7 ttl=58 time=3307.350 ms
64 bytes from 212.23.3.100: icmp_seq=8 ttl=58 time=2307.465 ms
64 bytes from 212.23.3.100: icmp_seq=10 ttl=58 time=336.797 ms
64 bytes from 212.23.3.100: icmp_seq=11 ttl=58 time=32.153 ms
64 bytes from 212.23.3.100: icmp_seq=13 ttl=58 time=2258.254 ms
64 bytes from 212.23.3.100: icmp_seq=14 ttl=58 time=1258.072 ms
64 bytes from 212.23.3.100: icmp_seq=15 ttl=58 time=257.886 ms
64 bytes from 212.23.3.100: icmp_seq=16 ttl=58 time=31.105 ms
64 bytes from 212.23.3.100: icmp_seq=17 ttl=58 time=3110.678 ms
64 bytes from 212.23.3.100: icmp_seq=18 ttl=58 time=2110.769 ms
64 bytes from 212.23.3.100: icmp_seq=19 ttl=58 time=1139.461 ms
64 bytes from 212.23.3.100: icmp_seq=20 ttl=58 time=142.393 ms
64 bytes from 212.23.3.100: icmp_seq=21 ttl=58 time=29.261 ms
64 bytes from 212.23.3.100: icmp_seq=22 ttl=58 time=3275.200 ms
64 bytes from 212.23.3.100: icmp_seq=23 ttl=58 time=2275.256 ms
64 bytes from 212.23.3.100: icmp_seq=24 ttl=58 time=1314.971 ms
64 bytes from 212.23.3.100: icmp_seq=25 ttl=58 time=316.191 ms
64 bytes from 212.23.3.100: icmp_seq=26 ttl=58 time=29.871 ms
64 bytes from 212.23.3.100: icmp_seq=27 ttl=58 time=3097.048 ms
64 bytes from 212.23.3.100: icmp_seq=28 ttl=58 time=2096.986 ms
64 bytes from 212.23.3.100: icmp_seq=29 ttl=58 time=1126.190 ms
64 bytes from 212.23.3.100: icmp_seq=30 ttl=58 time=127.525 ms
64 bytes from 212.23.3.100: icmp_seq=31 ttl=58 time=28.869 ms
64 bytes from 212.23.3.100: icmp_seq=33 ttl=58 time=2425.877 ms
64 bytes from 212.23.3.100: icmp_seq=34 ttl=58 time=1425.730 ms
64 bytes from 212.23.3.100: icmp_seq=35 ttl=58 time=1001.442 ms
64 bytes from 212.23.3.100: icmp_seq=36 ttl=58 time=30.232 ms
64 bytes from 212.23.3.100: icmp_seq=38 ttl=58 time=2441.496 ms
64 bytes from 212.23.3.100: icmp_seq=39 ttl=58 time=1441.439 ms
64 bytes from 212.23.3.100: icmp_seq=40 ttl=58 time=441.249 ms
64 bytes from 212.23.3.100: icmp_seq=41 ttl=58 time=30.432 ms
64 bytes from 212.23.3.100: icmp_seq=42 ttl=58 time=3287.105 ms
64 bytes from 212.23.3.100: icmp_seq=43 ttl=58 time=2287.152 ms
64 bytes from 212.23.3.100: icmp_seq=44 ttl=58 time=1316.517 ms
64 bytes from 212.23.3.100: icmp_seq=45 ttl=58 time=318.959 ms
64 bytes from 212.23.3.100: icmp_seq=46 ttl=58 time=29.508 ms ^C
--- 212.23.3.100 ping statistics ---
49 packets transmitted, 41 packets received, 16% packet loss round-trip min/avg/max/stddev = 28.869/1197.761/3307.350/1107.757 ms
iStumbler showing 52%/37% signal strength - Airport Extreme-N/Airport Express-N
Vista Ultimate - 94% signal strength
Reply from 212.23.3.100: bytes=32 time=28ms TTL=58
Reply from 212.23.3.100: bytes=32 time=3525ms TTL=58
Reply from 212.23.3.100: bytes=32 time=29ms TTL=58
Reply from 212.23.3.100: bytes=32 time=30ms TTL=58
Reply from 212.23.3.100: bytes=32 time=29ms TTL=58
Reply from 212.23.3.100: bytes=32 time=29ms TTL=58
Reply from 212.23.3.100: bytes=32 time=29ms TTL=58
Reply from 212.23.3.100: bytes=32 time=30ms TTL=58
Reply from 212.23.3.100: bytes=32 time=29ms TTL=58
Reply from 212.23.3.100: bytes=32 time=28ms TTL=58
Reply from 212.23.3.100: bytes=32 time=29ms TTL=58
Reply from 212.23.3.100: bytes=32 time=29ms TTL=58
Reply from 212.23.3.100: bytes=32 time=28ms TTL=58
Reply from 212.23.3.100: bytes=32 time=28ms TTL=58
Reply from 212.23.3.100: bytes=32 time=28ms TTL=58
Reply from 212.23.3.100: bytes=32 time=28ms TTL=58
Reply from 212.23.3.100: bytes=32 time=28ms TTL=58
Reply from 212.23.3.100: bytes=32 time=28ms TTL=58
Reply from 212.23.3.100: bytes=32 time=29ms TTL=58
Reply from 212.23.3.100: bytes=32 time=28ms TTL=58
Reply from 212.23.3.100: bytes=32 time=28ms TTL=58
Reply from 212.23.3.100: bytes=32 time=31ms TTL=58
Reply from 212.23.3.100: bytes=32 time=28ms TTL=58
Reply from 212.23.3.100: bytes=32 time=29ms TTL=58
Reply from 212.23.3.100: bytes=32 time=29ms TTL=58
Reply from 212.23.3.100: bytes=32 time=29ms TTL=58
Reply from 212.23.3.100: bytes=32 time=28ms TTL=58
Reply from 212.23.3.100: bytes=32 time=28ms TTL=58
Reply from 212.23.3.100: bytes=32 time=28ms TTL=58
Reply from 212.23.3.100: bytes=32 time=29ms TTL=58
Reply from 212.23.3.100: bytes=32 time=29ms TTL=58
Reply from 212.23.3.100: bytes=32 time=35ms TTL=58
Reply from 212.23.3.100: bytes=32 time=29ms TTL=58
Reply from 212.23.3.100: bytes=32 time=29ms TTL=58
Reply from 212.23.3.100: bytes=32 time=29ms TTL=58
Reply from 212.23.3.100: bytes=32 time=29ms TTL=58
Reply from 212.23.3.100: bytes=32 time=29ms TTL=58
Ping statistics for 212.23.3.100:
Packets: Sent = 50, Received = 49, Lost = 1 (2% loss),
Approximate round trip times in milli-seconds:
Minimum = 28ms, Maximum = 3525ms, Average = 164ms

Mac OS X (10.6.3)
Use Software Update or the OS 10.6.8 combo update to update your OS. Also, update everything SU has to offer for your computer. When done, repair permissions and restart your computer.
You should get your wifi/airport back after doing the above.

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Vista & OSX wifi performance on MacBook Pro

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