people should be aware that using an open DNS, Google DNS or similar instead of their own ISP's DNS servers can cause problems with content that's delivered by a content delivery network, such as iTunes or Netflix.
With normal websites, a site is hosted at one location, often on a single machine; larger websites use multiple servers but they are still all in the same place. If you happen to live near to this location, you will possibly see faster access to the site as there are fewer "hops" over the internet from you to the servers compared to someone further away.
To save huge amounts of data travelling half way around the world and clogging up the internet, services that supply huge amounts of data such as iTunes and iPlayer tend to use distributed content delivery networks; someone in California gets the content from San Francisco (say), whilst for someone in the UK, they get the content from London. In order for this to work, the DNS server must give the person in California the IP address for the servers in SF, whilst it must give the person in the UK the IP address for the servers in London. Only your own ISP's DNS will give you the correct IP address; Open DNS/Google DNS do not. In fact, they can end up giving out random IP addresses; on Monday a given user might get the IP address for servers in Malaysia, and on Tuesday the same person could be given the IP address for servers in France. The further, geographically, you are from the server the higher the latency (due to more "hops"; can be a problem from streaming services) and the more likely your connection to suffer from congestion and lost packets decreasing bandwidth (problem for both streaming and download sites).
If you use Open DNS/Google DNS and have poor experience with iTunes, Netflix etc., try changing back to your ISP's DNS servers.
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