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The user initiates a navigation, and the browser gets busy: it'll likely have to resolve a dozen DNS names, establish an even larger number of connections, and then dispatch one or more requests over each. In turn, for each request, it often does not know the response size (chunked transfers), and even when it does, it is still unable to reliably predict the download time due to variable network weather, server processing times, and so on. Finally, fetching and processing one resource might tri...