networking with belkin

i have a belkin router and i use virgin media as my isp.  i have upto 20mb connection. when i connect my toshiba qosmio laptop directly to the belkin54g router the internet speed works fine. however when i go wireless there is a atleast 40% decrease in performance.

both laptop and router are capable of transmitting and receiving 20mb so why do i get the performance issue when im on wireless

i would be great full if someone can address this problem

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For starters wireless is half duplex so right away your performance begins to decline.
Here's an article about fine tuning your laptop.

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