having problem with IPv6
i need help with this problem my web browser is running slow and sometimes it opens nothing. i checked a friend same Mac pro with the same wifi but it seems that its working normally with him, so i went in to the sitting and i found that we have deffrent in the photo below. he has nothing next to the router or the IPv6 Address but i did not know how to change it.PLZ HELP???
MacBook Pro, OS X Mavericks (10.9.1)