Slow Internet Connection on iMac G5 with Airport or Ehernet

I'm running 10.5.8 on a Power PC G5 iMac (ISight) with 2.5GB SDRAM and 40GB spare space on the hard disk. There's 2 ways I can connect to the internet:
Using Airport, where I get a max download speed of 3Mbps.
Using a Devolo powerline bridge where download speeds are also 3Mbps. The spec transfer rate of the Devolo device is 14 Mbps. All download speeds are measured using www.speedtest.net, and I have a 802.11g wireless router.
My ISP subscription is for 16 Mbps, which I can almost achieve on my iPad elsewhere in the house.
As a straight comparison test, I ran the speedtest on the iMac with a Windows XP machine right beside it. While the Windows machine returned a max download of 7Mbps, the same test at the same time on the iMac only recorded 2.5Mbps.
I have done all the ususl things: reset permissions, rebooted PRAM, reset the router, deleted all wireless connections from the iMac etc.
It therefore appears that, whichever means of connection is used, the iMac can only reach 3 Mbps. Is this something which could be a function of the age of the iMac (6 years) and its spec, or is there something I can do to improve the speed and return it to the higher levels I used to enjoy?

Hi Paul,
That really is a first...if you go over to the iPad discussions there are a lot of complaints about the iPads are so slow compared with the uers' Macs/PCs, etc. You must be the first person to say their iPad is faster than their iMac
It is very possible the issue is the age of the iMac, though it seems the speed is a little low for a machine connected by ethernet. I could understand the slower transfer rate on wireless since the older AirPort cards were much slower than today.
I don't have my 802.11 standard here right now, over at my daughter's house, but the transfer rates you quote for the service provider sound like the g-protocol limits in free-air. So the half-speed rate is not an unreasonable reduction.
When you say you used to enjoy higher transfer rates, was that with 10.5 or 10.4? Just curious, because improvements in OSs often carry along higher system overhead, also.
Ralph

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