Airport extreme throughput not what it should be!

I have an airport extreme base station distributing IP addresses as a router and connected to a cable modem. My tests are with my Powerbook G4 Ti 1 GHz that only has 802.11b and not g. The extreme is set up for the b/g setting but I think I tested it with just b and got the same results. Basically, when I connect direct to the ethernet side of the base station I get about 5.6 mbps throughput using the test at http://www.speakeasy.net/speedtest/ But when I connect wirelessly I only get about 2.7 mbps. I took my airport express out of the picture so this is just direct to the extreme.
When I was at my sister's house with her Linksys router I got about 4.6 with a similar raw cable speed. So it seems as though the airport extreme is losing quite a bit of throughput from what it should be. I am running the latest firmware on the extreme and the Powerbook has all the latest also, but the throughput has always been about this. Anybody have any comments on this, or tips to improve it? I tried turning off IPV6 and it improved slightly but not significantly.
Powerbook Ti 1G   Mac OS X (10.4.4)  

There's a discrepancy between the OS and the DVD manufacturer in the way capacity is measured on the media.
The media manufacturer (much like a hard drive manufacturer) uses a decimal measurement, so they are going to consider a gigabyte to be 1,000,000,000 bytes. (1000 x 1000 x 1000). So, your 4.7GB DVD is 47 billion bytes. (47,000,000,000 bytes.)
However, the OS is going to consider a gigabyte to be slightly more, because its measurements are in binary. To the OS, a gigabyte is 1,073,741,824 bytes. (1024 x 1024 x 1024). In this case, your 4.7GB DVD looks like 4.37GB.
The OS will only allow you to burn as much as it can recognize as being available space, which would be about 4.3GB.

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