PageSpeed: Optimize the order of styles and scripts
Overview
Correctly ordering external stylesheets and external and inline scripts enables better parallelization of downloads and speeds up browser rendering time.
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Details from Google
Because JavaScript code can alter the content and layout of a web page, the browser delays rendering any content that follows a script tag until that script has been downloaded, parsed and executed. However, more importantly for round-trip times, many browsers block the downloading of resources referenced in the document after scripts until those scripts are downloaded and executed. On the other hand, if other files are already in the process of being downloaded when a JS file is referenced, the JS file is downloaded in parallel with them.