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Troubleshooting Common WP Fastest Cache Issues: Fonts, Styling, and Character Encoding

36 threads Sep 9, 2025 Plugin → Wp fastest cache

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WP Fastest Cache is a powerful tool for speeding up your WordPress site. However, like any caching plugin, it can sometimes cause unexpected issues with how your site displays. Based on community reports, some of the most frequent problems involve broken fonts, strange formatting, and character encoding errors after activation.

This guide will walk you through the common causes and the most effective solutions to get your site looking perfect again.

Why Do These Display Issues Happen?

Caching plugins work by saving static copies of your pages. This process can sometimes interfere with how dynamic elements, like fonts or multilingual content, are loaded. The most common culprits are features designed to combine and minify CSS and JavaScript files to reduce HTTP requests. While these are excellent for performance, they can occasionally conflict with other theme or plugin code.

Common Solutions to Try First

1. Disable "Combine CSS"

This is the most common fix for issues related to fonts and styling. The "Combine CSS" feature merges multiple stylesheet files into one. If this process doesn't execute perfectly, it can break the path to self-hosted fonts or cause CSS to load in the wrong order.

How to do it: In your WP Fastest Cache settings, uncheck the "Combine CSS" option. After disabling it, make sure to clear all cache, including any minified files.

2. Check for Plugin or Theme Conflicts

Conflicts with other plugins are a common source of problems. A conflict can prevent settings from being saved correctly or cause unexpected behavior.

How to do it: Temporarily disable all other plugins. If the issue is resolved, reactivate them one by one to identify the culprit. Seed Booster and optimization plugins have been known to cause issues. Also, test using a default WordPress theme (like Twenty Twenty-Four) to rule out a theme-specific conflict.

3. Exclude Problematic Pages or Parameters

If the issue only occurs on specific pages or when a URL parameter (like ?fbclid= for Facebook clicks) is present, you can exclude them from being cached. This ensures dynamic content on those pages always loads correctly.

How to do it: Navigate to WP Fastest Cache > Settings > Exclude. You can exclude pages by adding their slug (e.g., forgot-password) or exclude URLs containing specific parameters like fbclid.

4. Set a Cache Timeout for Dynamic Content

If you have content that updates frequently, like an event calendar, a permanently cached page will not show the changes. Setting a cache timeout rule automatically clears the cache for that page at set intervals.

How to do it: Use the Cache Timeout feature to specify how long a page should be cached before it is regenerated.

Advanced Troubleshooting: Character Encoding

If you see strange characters (e.g., � or äöü) instead of correct diacritics, it's often a character encoding conflict. This can happen when a page is cached with one charset (like ISO-8859-1) but should be served as another (like UTF-8).

Solution: As mentioned above, excluding URLs with parameters that trigger this error is the most effective fix. You can also ensure your database and WordPress configuration are set to use UTF-8 encoding.

What to Do If Nothing Works

If you have tried these steps and the problem persists, a more specific conflict might be at play. In these cases, it is recommended to:

  • Clear your browser cache and cookies.
  • Check for any server-level caching (e.g., Endurance Cache) from your hosting provider and ask them to disable it.
  • Reach out to your theme or plugin author for the specific functionality that is broken, as they may have known conflicts or workarounds.

By methodically working through these solutions, you can resolve most display issues and enjoy the speed benefits of WP Fastest Cache without sacrificing your site's appearance.

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