How to Defer Loading Large CSS Files: Should You Use Dynamic JavaScript Loading?

How to Defer Loading Large CSS Files

As part of CSS delivery optimization, you may want to defer the loading of a large CSS file until after the page has loaded. This can be achieved using the following approach:

Use JavaScript to Dynamically Load the CSS File

One option is to use JavaScript to dynamically load the CSS file after the page has loaded. For example, using jQuery, you can use the following code:

<code class="javascript">function loadStyleSheet(src) {
    if (document.createStyleSheet){
        document.createStyleSheet(src);
    }
    else {
        $("head").append($("<link rel='stylesheet' href='"+src+" />"));
    }
};</code>

You can then call this function after the page has loaded.

Disable JavaScript to Verify

To verify that this approach works, disable JavaScript in your browser and reload the page. You should see that the CSS file is not loaded until after the page has loaded.

Note for Non-JavaScript Approaches

If you prefer a pure-JavaScript approach or other JavaScript frameworks, please comment below, and we can provide additional solutions.

Remember, experimenting with different approaches and testing them in your own environment is always recommended to find the optimal solution for your specific use case.

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