Issue with Airport-iMac data transfer speed

Hi, folks. On 10.6.4 and 10.6.5, we'd recently seen the internet slowing down on our Intel iMac (not on MacBook Pro or either of our old G5 computers running tiger). I did some searching but couldn't track down an obvious solution. Symptom was app agnostic (i.e. it showed up in Safari, Firefox, Mail and Software Update).
One of our airport hubs sits just behind the iMac, though it was connecting wirelessly - when I connected the iMac via ethernet cable to the Airport, the speed of rendering, etc. came back immediately, no delays. I've now switched off the Airport at the iMac end completely.
So, bottom line appears to be that the wireless connection between iMac and Airport has slowed down. Any ideas about possible cause?
Thanks,
Vince

Vincent Tuckwood wrote:
bottom line appears to be that the wireless connection between iMac and Airport has slowed down. Any ideas about possible cause?
It may not show you anything useful, but I'd use the advice in this thread to investigate the signal and noise levels that the iMac sees:
http://discussions.apple.com/thread.jspa?threadID=2347845&start=1

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