WRT400N lowers cable modem speed

Hi,
 I use a cable/internet provider and when connecting my laptop to their cable modem port directly, I see download speeds of 15-22 Mbps consistently. But when I connect the Linksys/Cisco WRT400N to the cable modem, the speed at the WRT400N's direct connect LAN port drops to 5-7 Mbps and via a WiFi link, I see a similar 5-7 Mbps speed. Why is the WRT400N AP/router dropping the speed by a factor of 3?  Any help is greatly appreciated.

I have a WRT600N - and it is even worse.  Troubleshooting with comcast, connected directly to modem - I get around 15, but through my router - can't get above 1.8....  Unfortunately, my router is now out of warrantee - so - no linksys tech support without a fee!  Any suggestions on what settings may need to be tweaked?  I have tried resetting the router, but it doesn't give me any improvement in speed.

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