URLs contain CSS files of size over 15 KB. The figure of 15 KB is relatively arbitrary – there is no hard and fast rule as to what constitutes a CSS file that is ‘too large’.
Why it’s Important
The smaller CSS files are, the faster they are downloaded, resulting in a faster execution by the browser.
How to Check the Issue
When using our Sitechecker tool, you’ll find an invaluable feature for optimizing your website’s load time. Specifically, the section highlighted in the screenshot, “CSS file size is over 15 KB”, is designed to help you identify and address efficiency issues related to the size of your CSS files.
When you click “View issue,” the tool will not only provide you with a list of the pages where the CSS file size exceeds 15 KB, but it will also offer a detailed view of each instance. You’ll see the exact size of the CSS file and receive actionable recommendations for reduction, ensuring your pages load quickly and smoothly.
Optimize Your CSS, Accelerate Your Site!
Use our tool to identify and minimize CSS files over 15 KB.
How to Fix This Issue
CSS files can contain unnecessary characters, such as comments, whitespaces, and indentation. In production, these characters can be safely removed, to reduce file size without affecting how the browser processes the styles. This technique is called minification.
CSS Minification is an industry best practice that should be incorporated into your development workflow so that your production website is optimized for performance. Some content management systems like WordPress have many plugins that help to reduce CSS file size in a few clicks.
