If you have a Mac and DNS resolution seems really, really slow – like, five seconds or more per lookup – check to see if you have an IPv6 address. You probably do.

Then check to see if you have an IPv6 DNS server listed. I bet you don’t, or it’s wrong.

Solution: add an IPv6 DNS server to your list.

• Google DNS IPv6: 2001:4860:4860::8888 and 8844

• OpenDNS IPv6: 2620:0:ccc::2 and ccd::2