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Three laptops on the same wifi router all talking to each other at once can be very problematic, especially if it's an inexpensive consumer router with one radio. Only one device can shout into the wifi ether at once and the protocol has backoffs to make sure multiple devices don't clobber each other by talking at the same time. Add on top of that other backoff strategies in higher level protocols like in TCP and you can have abysmally slow connections for anything.



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