Safest way to undo the wireless laptop

I am using the laptop on wireless with the WRT54G and desktop wired. Good. Want to test the laptop as wired.
Why? Noticed the desktop latency of around 300 ms and it's a slow desktop. The laptop is almost 20 times as fast, relatively, and its latency is 600 ms. So wondered if that's a function of the wireless versus wired.
But if I connect a wire to the laptop, I must disconnect its wireless setup? How to do that and not screw things up? So much hassle to set it up that I don't want to have to go through all my notes and configurations.
Any ideas? The double latency of a much faster computer, must be due to the wireless over a wired connection?

Messed that up. I meant a much faster computer, the laptop, with a Core Due cpu and 3 GB of RAM, should not have twice the latency of a sloooow desktop. And this double latency is a function of the wireless overhead over the wired? I was using numion.com for the testing. Nice website. I get around 300,000 bits per second in the USA surfing. But almost double that with the laptop, 500,000 bits per second yet double the latency. Want to see how fast the laptop really is if it has the lowered latency when wired directly to the router. My network is only 768,000 bit per second download. I downgraded the network when I saw that surfing speed is rather limited during the day. Not pure downloads but surfing. But maybe I need to analyze all that more. Too much time on my hands. More fun to do this than the real work.

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