The reviews are in: Google Public DNS performance is... OK
It seems to depend wildly from ISP to ISP. If you're fortunate enough to have an Internet provider like Verizon's FiOS that runs a finely-tuned, well-oiled network, Google Public DNS is simply not for you. If you're one of the (many) that has poorly-maintained DNS servers, the Google service might help considerably. But we're skirting the real issue here: does Google's Public DNS outperform the current 'industry standard' provisions from OpenDNS? Yes, it does. Just.
Either way, we're talking about a few milliseconds -- milliseconds that add up over days or weeks. It's well known that fractions of a second can change the outcome of someone looking to buy from an e-commerce website. I don't know about you, but I actually find myself drumming my fingers impatiently when a site takes more than a second or two to load -- crazy, when you consider just how quickly things are actually happening, compared to the online world a decade ago.
Let's not forget that Google just launched this service. OpenDNS have been around for years. Let's also not forget that their services are functionally different -- Google just want to speed up the 'net, while OpenDNS is an enterprise offering that can provide adult-content filtering and more.
[via Jon Radoff]