A guide to loading CSS and JavaScript files asynchronously

Is it possible to use loadCSS (https://github.com/filamentgroup/loadCSS/blob/master/README.md) to allow the browser to asynchronously load CSS and JavaScript?

This is what I currently have in my head tag: 

<link rel="preload" href="http://zoidstudios.com/assets/css/main.css" as="style" onload="this.rel='stylesheet">
<noscript><link rel="stylesheet" href="http://zoidstudios.com/assets/css/main.css"></noscript>

And at the bottom of my HTML file :

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script src="https://use.fontawesome.com/eb515f50a5.js"></script>
<script src="http://zoidstudios.com/assets/js/functions.min.js"></script>
<script src="http://zoidstudios.com/assets/js/loadcss.min.js"></script>

<script>
    loadCSS( "http://zoidstudios.com/assets/css/main.css" );
</script>
javascripthtmlcss

Answer №1

Perhaps exploring tools like RequireJS or webpack could be beneficial in your situation. These loaders are designed to handle CSS loading seamlessly and also offer plugins for asynchronous loading of CSS, JS, and other resources while managing dependencies effectively. If you have a large number of files to load, choosing a suitable loader would be a wise decision.

Answer №2

The issue does not lie within the CSS styling of your webpage. If PageSpeed is indicating a slow page load time, it may be due to the numerous <script> tags located towards the end of your <body> tag. Just because they are placed within the body tag does not guarantee asynchronous loading.

To rectify this, you can keep all scripts in the <head> section and utilize the attributes async or defer for asynchronous loading. For more information on this topic, refer to this informative article.

For example, you can implement the following script:

<script
    src="http://zoidstudios.com/assets/js/functions.min.js"
    defer>
</script>

If any of these scripts require certain elements in the DOM to be parsed beforehand, opt for defer over async, as detailed in the referenced article. Alternatively, if those scripts do not rely on specific elements, use async and keep them within the <body> tag.

Update

In case my assumption holds true (that PageSpeed does not endorse rel='preload' on <link> tags), consider that the guidance provided in your mentioned documentation suggests

to integrate the loadCSS script, along with the loadCSS rel=preload polyfill script in your page (inline for immediate execution, or in an external file if the CSS is low-priority)

By following this advice and adopting the recommended polyfill, you could potentially resolve the final warning message.

The broader query of "how can I load CSS asynchronously?" has been extensively discussed on StackOverflow, as evidenced by various inquiries and responses available through search results.

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