Slow internet connection over ethernet, fast over wireless?!

Using an Airport Extreme (802.11n) I am connected to the internet through an X-Modem. My Macbook connects to the internet wirelessly and can download a large web page in 13 seconds, the same page takes 85 seconds when downloaded by my G4 iMac using an ethernet connection directly to the Airport (even if the MacBook is switched off).
I have eliminated the iMac as the culprit by plugging the ethernet cable directly into the modem as a test and achieving a decent connection speed.
Any bright ideas about how to solve this little connundrum?

Glyn
Checked my Network settings as suggested. The DHCP was fine but somehow I had a specified server in the 'DNS servers' box. Cleared this and the iMac is now connecting perfectly.
Thanks to you and Duane for your hepl.
PR

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