IMac internet speed terrible compared with my pc

Hi.
I have an intel-based imac with OS X 10.5.2
the only problem i have with it is that the internet speed is terribly slow.
simple pages like blogs, wikipedia or even google can take very long to load.
my laptop pc, as well as other laptops and computers i have have no problems with the internet, everything goes pretty fast.
only the imac has this issue of a terrible internet connection speed.
any suggestions on how to resolve this?

How are you connected to the internet?
Is your system using a wi-fi network, an ethernet hub (shared)
or some other; and if so, have you tried the iMac by itself on
line direct without any other device, except for the modem or
other ISP provided device?
There has to be a configuration setup difference in the iMac
and perhaps, depending on what your internet situation is,
that could be changed and the problem somewhat reduced.

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