The performance is not lost by much (sometimes you may not even realize there is) but fact is depends on how good the strength of your wireless is.

But let me tell you the truth bro..my modem is faraway as well (like thirty feet far)
but i had a wre connecting to my router in my study. Thing is no performance is lost.
Why didnt I get a wireless router?

Expensive friend...

1)Wireless router-(depends on quality and brand)
2)Wireless adapter -$80US or roughly RM300

Stick to wires friend but as I said theres little or no performance lost. That is if you are very lucky (if you live next to one of those huge wireless Wifi towers for example).

But decision is ultimately yours. So good luck bro drop us of a friend request Okay?