Popular web sites spending between 5% and 38% of the time downloading the HTML document. The other 62% to 95% of the time is spent making HTTP requests to fetch all the components in that HTML document (i.e. images, scripts, and stylesheets). The impact of having many components in the page is exacerbated by the fact that browsers download only two or four components in parallel per hostname, depending on the HTTP version of the response and the user’s browser. Our experience shows that reducing the number of HTTP requests has the biggest impact on reducing response time and is often the easiest performance improvement to make.
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No you don’t have to be an expert to implement Google’s CDN functionality on WordPress , just install / activate “Use Google Libraries ” . This plugin allows your WordPress site to use the content distribution network side of Google’s AJAX Library API, rather than serving these files from your WordPress install directly.