Using this DNS service will degrade your performance to almost any non-Google rich media content, pure and simple.
If you use Google's DNS service, because Google has your client IP, they can serve your content the fastest from the closest POP, however by using this DNS service you are actually creating an issue called "resolver proximity" for every CDN on the planet. This will be especially evident to those of you not in North America who unwittingly point to these servers.
In most global markets your best strategy is to use your local DNS resolver so the people who deliver everything from Netflix, iTunes, Hulu, ustream, (etc, etc, etc) understand that you're not in San Jose or Northern Virginia but really in Tokyo or Malaysia. If your ISP uses a DNS server that's "far" away from you (in terms of network latency) you should complain loudly.
If you use Google's DNS service, because Google has your client IP, they can serve your content the fastest from the closest POP, however by using this DNS service you are actually creating an issue called "resolver proximity" for every CDN on the planet. This will be especially evident to those of you not in North America who unwittingly point to these servers.
In most global markets your best strategy is to use your local DNS resolver so the people who deliver everything from Netflix, iTunes, Hulu, ustream, (etc, etc, etc) understand that you're not in San Jose or Northern Virginia but really in Tokyo or Malaysia. If your ISP uses a DNS server that's "far" away from you (in terms of network latency) you should complain loudly.