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Troubleshooting Common CSS and Font Issues in LiteSpeed Cache

57 threads Sep 16, 2025 Plugin → Litespeed cache

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Many WordPress users leverage the powerful optimization features of the LiteSpeed Cache plugin to boost their site's performance. However, a frequent category of issues involves CSS and web fonts not loading or displaying correctly after enabling certain optimizations. This guide will explain why these problems occur and walk you through the most common and effective solutions, based on community reports and resolutions.

Why Do These CSS and Font Issues Happen?

The core of these problems often lies in how aggressive optimization features interact with your theme and other plugins. Key features like Unique CSS (UCSS), Asynchronous CSS Loading, and CSS/JS Minification/Combination work by rewriting and reorganizing your site's code. While this is great for speed, it can sometimes break the dependencies or load order that your theme's styles and fonts rely on to display properly.

Common Solutions to Try

1. Identify and Exclude Problematic Files

If a specific CSS file, like your theme's style.css or a font file, is causing issues, adding it to an exclude list is often the fastest fix.

  • For CSS: Navigate to LiteSpeed Cache > Page Optimization > CSS Settings. Try adding the file path (e.g., style.css) to the "CSS Excludes" or "UCSS File Excludes" setting.
  • For JS: Navigate to LiteSpeed Cache > Page Optimization > JS Settings. Add problematic JavaScript files to the "JS Excludes" or "JS Deferred Excludes" lists.

2. Purge All Caches and Regenerate

After changing any settings, it is crucial to purge all caches. Simply updating a setting may not immediately fix a page if older, cached versions of CSS (like UCSS) are still being served.

  • In your WordPress admin bar, click LiteSpeed Cache > Purge All > Purge All - CSS/JS.
  • You may also need to specifically Purge All - UCSS to force the plugin to regenerate its unique CSS files with your new settings applied.

3. Utilize the UCSS Allowlist

If specific elements (like a menu with a certain font color) are not styled correctly by UCSS, you can tell the plugin to always include them.

  • Navigate to LiteSpeed Cache > Page Optimization > CSS Settings > UCSS Selector Allowlist.
  • Add the CSS selector for the element (e.g., .menu-title-text). Save changes and purge all caches.

4. Check for Plugin and Theme Conflicts

As seen in the sample threads, other plugins that modify how assets are loaded (e.g., head sorting plugins) can conflict with LiteSpeed's optimization processes.

  • Temporarily disable other optimization or asset management plugins to see if the issue resolves.
  • Reach out to the other plugin's support to inquire about known conflicts with LiteSpeed Cache.

5. Use the "Send to LiteSpeed" Report Tool

When asking for help in communities, generating a report is the standard first step. It provides detailed configuration info that is essential for others to diagnose problems.

  • Navigate to LiteSpeed Cache > Toolbox > Report.
  • Click "Send to LiteSpeed" and provide the generated 8-character code when seeking help.

Conclusion

CSS and font issues can be frustrating, but they are usually solvable by methodically working through your optimization settings. Start by excluding key files, always remember to purge caches thoroughly, and leverage the allowlist for fine-grained control. If problems persist, checking for conflicts with other software is a logical next step. The LiteSpeed Cache plugin is a powerful tool, and finding the right configuration balance for your specific site is key to achieving both great speed and perfect design.

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