Very interesting findings: I found a hardware dependency! 
The bandwidth is quite fast 270–290 kB/s (almost as fast as it is supposed to 
be in practice – eg. in M$ Vista even 400 kB/s. The nominal speed used in a bit 
false marketing is 3,6 Mb/s) using Hardy Live-CD with an old IBM laptop with 
Pentium III (800 MHz). In the same time, using Hardy Live-CD with a more recent 
IBM desktop with Pentium 4 (3.20 GHz) the speed is slow 80 kB/s (almost as slow 
as in Jaunty, ie. ~40–55 kB/s). 

I did several download tests from Ubuntu servers during about two hours
today. I Have also earlier found that Hardy Live-CD gives a bit faster
download compared to Jaunty. Once, in the otherwise fast IBM laptop, the
download started slower (about 120–150 kB/s), but that could have been a
network or server "artefact", because when I immediately started a new
download from other place the speed was again 270–290 kB/s.

Jaunty (others have tested Karmic, check the links on my earlier post)
is slow (40–55 kB/s) also in Acer Aspire 3623wxci laptop with Intel
Celeron M 370 (1,5 GHz) and HP Compaq Business Desktop dc7100 P4 540
(3,2 GHz Prescott Socket T).

Who can make conclusion? Should this bug report be extended to affect
several packages?

** Attachment added: "lshw-IBM-laptop-fast.txt"
   http://launchpadlibrarian.net/39914510/lshw-IBM-laptop-fast.txt

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3G download speed is very slow compared to Hardy or Microsoft Windows OSs
https://bugs.launchpad.net/bugs/525049
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