How do I reduce unused CSS to improve my site's loading time
Asked on Oct 18, 2025
Answer
Reducing unused CSS is crucial for improving a site's loading time, as it minimizes the amount of CSS that the browser needs to download and process. This can lead to faster rendering and improved performance metrics like LCP.
Example Concept: Unused CSS can be reduced by using tools like PurgeCSS or the "Coverage" tab in Chrome DevTools to identify and remove CSS that is not used in your web pages. These tools analyze your HTML and JavaScript files to determine which CSS rules are actually applied, allowing you to eliminate any unnecessary styles.
Additional Comment:
- Consider using a CSS framework that allows for modular imports to include only the styles you need.
- Regularly audit your CSS files, especially after design changes, to ensure no obsolete styles remain.
- Implement critical CSS to inline the styles needed for above-the-fold content, deferring the rest.
- Use media queries to load CSS conditionally based on device characteristics.
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