Originally Posted by
Kelxin
WLAN opens up its own huge problems including anything from interference with other wireless networks in the neighborhood (you have no clue when your neighbor is going change their settings or put up a new wireless), to interference with other electronics in your house. Even a crappy lamp or radio can interfere with wireless. Not only that, if there is a section of the house that has vertical wiring going floor to floor, it will almost completely kill wireless signals trying to pass through it.
Communication across a hard wired ethernet cable from point to point is less than 1 ms. Communication across a wireless link is anywhere from 10 ms to 400 ms depending on conditions. Add your wireless delays to whatever internet delays you have, and it will turn into a lag fest under the wrong conditions. Beyond that, it seems whenever someone hears you have wireless, everyone and their mom wants to jump onto it. Wireless communication uses "shared" channels, which a device will pause to let other devices communicate momentarily which will add even more to your ping during peak wireless times.