How to optimize CMP loading times?
Here’s a list of general guidelines that will allow you to load your site quickly and not block users from interacting with it.
Choose a lightweight CMP
Select a Consent Management Platform (CMP) that is optimized for performance and has a minimal impact on page load times. Look for CMP providers that prioritize speed and efficiency in their implementations. Ideally, CMP providers should not contain any CSS scripts, only JS scripts that load first.
Load the CMP script as soon as possible
Load the CMP script as the first one on the page so that users can quicker agree to consent, and you will be able to generate events in JS to load ads after agreeing to it.
Load CMP asynchronously
Load the CMP script asynchronously to prevent it from blocking other resources on the page. This allows the rest of the page to render while the CMP loads in the background. You would like to use the async option in the script tag to start loading the consent script as quickly as possible or defer option if your CMP is dependent on the HTML structure of your site, but in most cases, you should just use async.
Ensure that you’re using minified and optimized versions of CMP scripts
Make sure to use minified versions of CMP scripts and optimized versions of them so that all unnecessary stuff is removed from them and only needed functions are contained there. Sometimes, when developing, you might use debug versions of scripts that contain excess codebase that is not needed on your site, as well as any other functionality that is not used. Ideally, you should only use what’s needed and not force users to download unnecessary stuff.
Cache CMP resources in the browser
To utilize browser caching for caching CMP resources, such as JavaScript files, CSS stylesheets, and images, you can set appropriate HTTP headers on the server hosting these resources. Use Cache-Control header to specify caching directives for the browser.
Use Expires header to specify a date and time after which the specified resources should be considered stale and must be revalidated with the server.
Use preconnect
When offered scripts and styles from consent management provider, you can use preconnect technology to start connecting to needed website to load scripts and styles faster, here’s the example for a case where CMP provider uses example.com as domain name for both CSS and JS scripts:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Example preconnect for loading JS scripts and CSS styles</title>
<!-- Preconnect to the server hosting JS scripts and CSS styles -->
<link rel="preconnect" href="https://example.com" />
<!-- Link to external CSS styles -->
<link rel="stylesheet" href="https://example.com/styles.css" />
</head>
<body>
<!-- Link to external JS script -->
<script src="https://example.com/example.js" defer></script>
</body>
</html>
Use CDNs
Consider using CDN services to deliver JS and CSS resources from servers located closer to the user, reducing latency and improving loading times.
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