Ethernet cable vs usb wireless adapter?

i'm trying to download a game demo (for red alert 3, and it's a freakin 1gb+ in size)...my family pc is directly connected to the router with an ethernet cable while my own desktop is connected to the internet using a wireless usb adapter....would the usb adapter have inferior/decreased performance when it... show more i'm trying to download a game demo (for red alert 3, and it's a freakin 1gb+ in size)...my family pc is directly connected to the router with an ethernet cable while my own desktop is connected to the internet using a wireless usb adapter....would the usb adapter have inferior/decreased performance when it comes to downloading or would there be no difference?..i wanna know 'cause i wanna decide which pc i want to download the file from...thanks =]
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