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1.Diffable ?is a method for reducing page load latency by transmitting differential encodings of static files. It works by sending deltas between versions of files that reside in a browser's cache. In web applications, files such as Javascript, HTML, and CSS are often updated every week or more, but change very little between versions. This method significantly reduces the bandwidth and transmission time for these files and is implementable on all legacy browsers that support Javascript.

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http://code.google.com/p/diffable/

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