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Other concerns include computational efficiency, as for data compression – finding a small patch can be very time and memory intensive.
Best results occur when one has knowledge of the data being compared and other constraints: diff is designed for line-oriented text files, particularly source code, and works best for these; the [[rsync]] algorithm is used based on source and target being across a network from each other and communication being slow, so it minimizes data that must be transmitted; and the updates for [[Google Chrome]] use an algorithm customized to the archive and executable format of the program's data.<ref>Chromium Blog: [http://blog.chromium.org/2009/07/smaller-is-faster-and-safer-too.html Smaller is Faster (and Safer Too)]</ref><ref>[http://dev.chromium.org/developers/design-documents/software-updates-courgette Software Updates: Courgette (The Chromium Projects)]</ref>
== Connection with data compression ==
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