Web browsers have a specific set of steps that must be completed before any page content can be shown to a visitor, which includes downloading and processing the minimum set of files required to start rendering the web page. Every file requested inside of the HTML <head> tags will be downloaded before the web browser can display the requested page content.
Avoid including JavaScript files inside of the <head> element and use inline CSS instead of extra stylesheets to reduce total download size and improve your website’s load times. Using HTTP/2 with Server Push can also improve website loading performance by allowing the website to send the information it knows the web browser will need without having to wait for the web browser to request that information first.
WordPress websites can use plugins to remove render-blocking JavaScript files from the <head> element and place critical CSS styling inline. Speed Coach’s Page Information section identifies the render-blocking JavaScript files on your website. You can use this information to identify WordPress plugins or themes that contain problem files.
Modern web servers like Apache and NGINX now have HTTP/2 support and can be configured to use HTTP/2 by experienced systems administrators.
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