This is cool and I've seen it before but I have a hard time interpreting the results. For instance, I have a hard time believing Google's DNS is substantially slower than anyone else's which leads me to question all the results.

Also, and I'm hoping someone here can clear this up for me, but it's not clear to me how these results translate to actual DNS performance for my site. I only vaguely understand how the magic of the internet works but don't the DNS results get distributed throughout the network making the performance of the root servers less relevant? If I could chop 50-100ms off my TTFB by switching my DNS from Namecheap to someone else, I would definitely pay for that, but it's not clear to me.