Question

two computers sharing home wireless connection?

do their connection speed slow down comparing with just one computer on the wireless home network?

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Answer
wireless contention.

Depends what you mean. On the wireless side both machines compete for the bandwidth and they do not share evenly so some gets wasted. So if you had say 54m running 802.11g. In a perfect world they would each get 27m. Still with only 2 machines it share pretty well so you could easily get 20m each.

Now all this doesn't really matter. Few if any home users have a internet connection that can really run 20m much less 54m.

In most cases it is the sharing of the internet connection itself that slows things down.

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Answer
It depends . . .

Since a wired or wireless connection is many times faster than an Internet connection, what specifically are you needing? If you're talking about a PC to PC connection, you get the advertised speed of each adapter. Any modern router will handle 100 Mb/s (Gigabit if the PC adapters are capable) per PC. These same routers will handle up to 255 wireless connections (depending on your settings), and in this case the bandwidth speed may drop if all of them are "on line" at the same time.

But remember this!

You'll never get the maximum advertised speed. Period.

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ok

ya, sometimes, both computers are online at the same time. one is a laptop with its own inside wireless equipment, another pc has this usb plug in wireless thing. so sometimes, only one computer can connect online, another one is super slow, almost zero connection. sometimes, both of the computers have good speed.
it is so random. so i don't know if it is because of the network outside of the home. or it was because of the wireless connection inside the home?

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RFI . . .

Radio frequency Interference might be the culprit. Other wireless devices such as cordless phones can cause problems. You might try changing the wireless channel on the router. Nothing to do on the PC, just the router.

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how.

oh, that sounds complicated.
so it is possible that connection speed will slow down when two computers are both online at the same time?

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Only . . .

if they are sending/receiving data at exactly the same time.

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multiple bands

I would verify both your machines can run the same speed. ie B,G,N
If one is say N and the other is G or worse B the router will attempt to switch back and forth. Some routers do this better than others but none do it well.
Set your router to only the fastest speed all the adapters support disable the rest. This is only a guess it can be many other things

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ok

the strange thing is that, it doesn't happen all the time.

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slowness

Would be nice if there is a easy answer but many many things cause connection to be slow.

Try to run one of the machines on a lan cable and leave the other wireless. See if both machines have issues at the same time. If the machine on the lan cable is affect also then you have a issue with your ISP. Most likey they oversold and you are competing with your neighbors for the limited bandwidth.

If it only does it on the wireless there is little you can do but change the channels until you get one that works better. To find the real problem in a wireless network takes special equipment and experience using it.

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