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Typical conversations about Web performance tend to revolve around client/server latency, database performance, and the time it takes a server to render and send HTML to the client. Those processes, however, generally account for only a fraction of the time a user spends waiting for content to load in a browser window. Greater time is spent downloading, caching, and displaying JavaScript, CSS, and images. Presentation layer performance tuning for Web applications really boils down to two simple concepts