MACs slow surfing the net

For the past few weeks I've been suffering, while surfing the internet from my wireless connection on my MAC laptops. Three computers where experiencing the same problem (Mac Book, Air, Pro). Whenever I tried to open a website, it would take forever to load. Yet my download speeds where fine about 6Mb down and 1Mb up. Also my wired connections didn't have this problem. I figured it was a problem with my wireless router, some interference, or having b and n devices on the same network. I used this opportunity to upgrade to the new Airport Extreme hoping it would be a quick fix. While the new router works great and provides to bands for 5Ghz and 2.5 Ghz it didn't fix the problem. So I decided to dig a bit deeper, I dropped into the terminal and decided to use ping to check the response time. I pinged yahoo's website which responds to ping requests and noticed the resolve time for the domain took a few seconds and my response time for the replies was fast (70ms). Typically the name resolution is instant, specially if the DNS is in the local network. I configured my router to use the open DNS servers and had a similar result (slow lookup time). After checking my configurations and scouring the internet I found some people having issues with IPv6 configuration. I decided to go into my configuration and disable the IPv6 and sure enough it fixed the problem. While I'm not sure what causes the problem with having IPV6 turned on to automatic, disabling it fixes the slow lookup issues.

Here is a step by step of what I did: (Type command in '')

1) HD->Applications->Utilities->Terminal

2) computername:~username'ping www.yahoo.com'

Response:"PING www-real.wa1.b.yahoo.com (209.191.93.52): 56 data bytes"

The response should be instant, the IP address might vary, they have multiple servers. If it took a few seconds you might be having the same issue.

Control C to stop ping command!

3) System Preferences -> Network -> Select Active Adaptor -> Advance

Set Configure IPv6 to OFF

Select OK

Select Apply

4) Retry Step 2 it should be instant...

You're Done!

Hope this helps and save you from buying a new router.