data Transfer rate priority on Postgres ?

<SPAN
style="FONT-FAMILY: Arial; mso-ansi-language: EN-US">I just installed
Postgres 8.0 (Windows native) on a HP server with Windows 2000 Server
Service Pack 4. This database is accessed by several windows PC’s with an
ODBC (ver. 7.03.02.00) through a 100Mbps intranet. <?xml:namespace prefix =
o ns = "urn:schemas-microsoft-com:office:office" />
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I have notice that when I run a program that requires about 2 MB of
information from the server to the PC, it takes about 2-3 seconds to load
the information in some PC’s and 20 to 30 seconds in other PC’s (at the
same time). This creates a situation where the program runs “faster” in
some PC’s than in others. But this situation is not hardware related
because one day a PC might have a “fast” connection and the next day the
same PC it will have a “slow” connection. Also if I swap a PC that has a
“fast” connection in the net point of another with a “slow” connection,
both PC´s will keep their rate of data transfer.<SPAN style="mso-spacerun:
yes">  It seems to me that something is assigning the rate of
data transfer and giving it a priority within the net.
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Does Postgres have any kind of configuration that determines the
speed of data transfer to the clients? Is there any kind of connection
priority? Or, this is a Windows configuration problem?
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We didn’t have this problem with version 7.4 (Cygwin), al the PC had
a “fast” connection.