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A web page can load a lot faster and feel faster if the Javascripts files referenced on the page can be loaded after the visible content has been loaded and multiple Javascripts files can be batched into one download. Browsers download one external Javascript at a time and sometimes pause rendering while a script is being downloaded and executed. This makes web pages load and render slow when there are multiple external Javascript references on the page. For every Javascript reference, browser stops downloading and processing of any other content on the page and some browsers (like IE6) pause rendering while it processes the Javascript.