Slow Airport Express blinking green - network traffic when all devices off?

My G5 imac and airport express are lightning fast when everything boots up, slow as molasses later. The airport express is 3 feet away from my G5, and hooked up by ethernet to a cable modem.
I've also noticed that my airport express is blinking green, showing network traffic, when both my imac and ipad are turned off - even though I have the airport express set to be hidden, password protected and limited to certain airport IDs. Is it possible that my airport are being hijacked, or is there another reason for the variability in speed? My MacScan and iAntiVirus report no malware or cookies or viruses.
imac intel Mac OS X (10.6.4) airport express 5.5.1

I've also noticed that my airport express is blinking green, showing network traffic, when both my imac and ipad are turned off - even though I have the airport express set to be hidden, password protected and limited to certain airport IDs.
The cable company sends continuous, almost non-stop garbage down the line. The tech guy at the cable company would say that the devices are "associating". That's why you see the green light flashing. You might want to turn off the "flash on activity" option and simply have it glow solid green...unless you like to watch the flashing, or you want to switch to DSL.
Try turning off the anti-virus to see if that helps wireless perform better. Most anti-virus applications do more harm than good. Otherwise, look for wireless interference from another nearby wireless network, cordless phone, or even that new security system at the neighbors.

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    Try turning off the anti-virus to see if that helps wireless perform better. Most anti-virus applications do more harm than good. Otherwise, look for wireless interference from another nearby wireless network, cordless phone, or even that new security system at the neighbors.

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    Message was edited by: bonesawgdub
    Message was edited by: bonesawgdub

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    http://support.apple.com/kb/ht3728
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