The demand for bandwidth in computer networks has been growing at a steady pace for the last several years, and a significant portion of that traffic is for the World Wide Web. At the same time, a large fraction of Internet users continue to rely on slow "last mile " links (such as modems and wireless links). We present a transparent proxy system that uses deltas and compression to increase the performance of web traffic over slow links. By using compression, the average transfer time for HTML objects can be reduced by a factor of 2.3, while using deltas can reduce the transfer time by a factor of 6.0. The techniques used by this system, if utilized by other proxies and/or web servers, could also be used to reduce the amount of web traffic that traverses a network. 1
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