PageSpeed: Combine external JavaScript (deprecated)
Overview
Combining external scripts into as few files as possible cuts down on RTTs and delays in downloading other resources.
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Details from Google
Good front-end developers build web applications in modular, reusable components. While partitioning code into modular software components is a good engineering practice, importing modules into an HTML page one at a time can drastically increase page load time. First, for clients with an empty cache, the browser must issue an HTTP request for each resource, and incur the associated round trip times. Secondly, most browsers prevent the rest of the page from from being loaded while a JavaScript file is being downloaded and parsed. (For a list of which browsers do and do not support parallel JS downloads, see Browserscope.)