Eliminate render-blocking resources on Google Fonts header image

Eliminate render-blocking resources on Google Fonts

And improve Lighthouse scores

Posted on 21st of October 2020 by Victor Dieppa Garriga

Using Google Fonts is a convenient way of loading beautiful fonts on your website, but it comes with a penalty when it comes to website speed optimization.

Running the Google Lighthouse tool, you will discover that the embedded CSS that you got from the fonts site it’s being highlighted as render-blocking.

<link href="https://fonts.googleapis.com/css2?family=Roboto:ital,wght@0,400;0,700;1,400;1,700&display=swap" rel="stylesheet">

By altering the <link> tag a bit we can preload and eliminate this:

<link rel="preload" href="https://fonts.googleapis.com/css2?family=Roboto:ital,wght@0,400;0,700;1,400;1,700&display=swap" as="style" onload="this.onload=null;this.rel='stylesheet'"/>
  <link href="https://fonts.googleapis.com/css2?family=Roboto:ital,wght@0,400;0,700;1,400;1,700&display=swap" rel="stylesheet" type="text/css"/>

It all comes to 3 changes.

  1. We added rel="preload" to our code do the browser starts loading the font before it’s being called.
  2. We used onload attribute to restore the rel="stylesheet" definition.
  3. We added <noscript> tag as a fallback in case the browser does not use JavaScript.

I want to thank Claudiu that posted an updated version of Lucas Vazquez’s solution here.