Many users have written in with news of Google and OpenDNS working together on The Global Internet Speedup Initiative. They've reworked their DNS servers so that they forward the first three octets of your IP address to the target web service. The service then uses your geolocation data to make sure that the resource you’ve requested is delivered by a local cache. From the article: "In the case of Google and other big CDNs, there can be dozens of these local caches all around the world, and using a local cache can improve latency and throughput by a huge margin. If you have a 10 or 20Mbps connection, and yet a download is crawling along at just a few hundred kilobytes, this is generally because you are downloading from an international source (downloading software or drivers from a Taiwanese site is a good example). Using a local cache reduces the strain on international connections, but it also makes better use of national networks which are both lower-latency and higher-capacity."
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