Combine External JavaScript (Deprecated)

Just as combining external CSS helps improve page load time and reduce latency, so does combining external JavaScript. And like the PageSpeed recommendation for combining CSS, the recommendation for combining JavaScript is similar. Additionally, they recommend splitting JavaScript into two files, one that loads the minimum code needed at initial startup, and one to render after the page load has completed. Another caveat of JavaScript is that browsers will not load the rest of a page if they encounter JavaScript code. It must download that file first and then work on the rest of the page elements. Additionally, consider where the JavaScript code is positioned in relation to other elements, to help take advantage of parallel loading.