Here is a little program (
DNS Benchmark) for testing DNS servers to find the fastest from your area. Run it and record the fastest into your router. I'm not sure how much difference it makes but my browser seemed to perk up a bit. 4.2.2.5 ended up changing places with 4.2.2.2 but I could have chased them around for little benefit.

Or just use OpenDNS 208.67.222.222, 208.67.220.220
Here is a good article on why you may want
OpenDNS.