Why are Tiger Connection Speeds Slower than Jaguar and PCs?

There is no doubt in my mind that Tiger (10.4.5 and 10.4.6 in my experience) connects to the Internet at speeds which are 20-25% slower than the speeds attained in Jaguar (I have no personal experience with Panther) and by PCs.
I have tested speeds at testmy.net and speakeasy.net on my Mac Mini running 10.4.6 (and before that 10.4.5), my iBook running 10.2.8, and my Dell Dimension 8250 running Windows XP. The iBook and Dell consistently measure 3400-3550 Kbps on a wireless connection to a LinkSys router and cable modem, whereas the Mini measures 2600-2900 Kbps (and sometimes much slower.) All three computers are next to one another, connecting to the same router and cable modem.
These results are very consistent over dozens of trials over a long period of time. They are not an aberration.
Any explanations or fixes? I have turned off IPv6, manually entered DNS servers in TCP/IP, tweaked settings with RMAC and Cocktail, but none of it has made a lasting difference. Interestingly, I have on a very few occasions found a speedup to PC and Jaguar levels on the first speed test only, after some of the listed adjustments.
Bob N.
Mac Mini 1.5 GHz; iBook 900 mHz; iPod 20 GB Mac OS X (10.4.5)

Im marking this as answered even though it isn't, just to get it off the list of unresolved questions, where it has gathered dust for many months.

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Message Edited by toomanydonuts on 01-07-2009 05:14 AM

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Hello everybody Lets get right to it shall we.
ADSL Line Status
Connection Information
Line state: Connected
Connection time: 0 days, 00:12:14
Downstream: 1.875 Mbps
Upstream: 448 Kbps
ADSL Settings
VPI/VCI: 0/38
Type: PPPoA
Modulation: G.992.1 Annex A
Latency type: Interleaved
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Output power (Down/Up): 17.2 dBm / 11.9 dBm
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CRC Events (Down/Up): 1 / 5
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Loss of Signal (Local/Remote): 0 / 0
Loss of Power (Local/Remote): 0 / 0
HEC Events (Down/Up): 0 / 0
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http://www.speedtest.net/result/1689620736.png
http://www.broadbandspeedchecker.co.uk/bimages/80146...
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http://www.samknows.com/broadband/exchange/SWLJ
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So after having Plusnet for a few years and bad teething problems for most of it I decided to move to BT and have the unlimited package with the home hub 3. Plusnet provided me with speeds between 1.8Mbps - 1.9Mbps using their Thompson Router, on a D-link Router the speeds were the same.
I know that BT owns Plusnet but I thought why not cut out the middle man and go straight to the main supplier, considering others in my street have speeds of 2.3Mbps and over with the likes of Sky, Talk Talk and Supanet, it seemed like a no brainer to go with BT.
My IP Profile with BT is a max 1.5Mbps and the fastest I can have is 1.44Mbps which seems strange considering I had more with plusnet? I complained to BT, the recommended way was to chat online via their chat app which to me seemed a better option. So after my first online chat I was advised that my speed was very low but to wait for 10 days for the line to stabilize from install.
12 days later the speed hits 0.8Mbps which more than warranted my second online chat. They advised me to run the usual checks, the only thing different from my setup was the change in router switching the Plusnet out for the BT Home Hub 3. So we checked everything, Filters, Ethernet Cables, Master Socket and so on....done this so many times with Plusnet and past providers but thought it best to do it all again for the sake of the BT Customer Support.
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It's been like this since install in early November, as my post states they did up my speed to just over 2mbps but it lasted one day and went back to 1.44Mbps. When the engineer came out he change some wiring for me just to be sure and said there were no errors or problems at me end, then the speed dropped to 1.2Mbps on his own device. I then complained again later that day and it went up to 1.7 ish and dropped back to my usual speed of 1.44, a speed that enables only one family member at a time to use any device, but can all use the net if we visit a basic text website with no pictures or flash.
Our PC's and Laptops, Netbooks are all Dual Core, Windows 7 with huge drives and lots of Ram, not that this matters at this time because the engineer tested his own equipment via the master socket.
If I read Sky news then nobody can play Xbox online or stream Lovefilm, Youtube, BBC iPlayer or use any other computer without dreadful lag and slow speed. The speed can cope fine with all over the above when only one person uses it.
My neighbour is with Supanet and he uses his pc upstairs whilst his wife uses her laptop and their son plays online via Xbox 360 all at the same time, his speed is 2.6 at the moment and he lives next door to me?
My other neighbour on the otherside of me has Talk Talk and they get 2.3Mbps...I mean Talk Talk gives them that speed? That truly is amazing for them but forget about BT matching any such speed, they can't even match the speeds I previously had with Plusnet and I thought they were slow

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