Does server-side caching break dynamic content?

Only if you misconfigure cache bypass rules. The configuration above skips cache for POST requests, query strings, logged-in users, and wp-admin. Dynamic content (forms, personalised recommendations, dynamic sidebars) either happens client-side (JavaScript) or in a separate cache-busting endpoint. The rule: if content must be different for every user, bypass cache. If it is the same for 95% of visitors, cache it.

How do I cache user-specific content without bypassing Nginx cache entirely?

Use fragment caching. Store user-specific widgets (recently viewed products, recommendations) in a separate JavaScript endpoint that runs after the cached HTML loads. The HTML is cached. The JavaScript fetch (which runs async) is not. This gives you the cache hit for the page structure and the dynamic update for the content.

What if I need to update content instantly without waiting for the cache to expire?

You need cache purging logic. WordPress plugins like Nginx Helper can purge the cache when you publish a post. For custom setups, write a PHP function that calls Nginx’s purge endpoint when content changes. Alternatively, set shorter TTLs (5–10 minutes instead of 60) for frequently updated content.

Is Nginx FastCGI cache the same as page caching plugins like W3 Total Cache?

No. W3 Total Cache caches at the WordPress application level (before the HTTP response is generated). Nginx FastCGI cache caches at the server level (after the HTTP response is generated). Server-level caching is faster because it bypasses PHP entirely on cache hits. However, server-level caching is harder to debug and purge because it is outside WordPress.

Should I use both application-level cache (WordPress plugins) and server-level cache (Nginx)?

No. They conflict. Choose one. Server-level cache is superior for most use cases because it is simpler, faster, and does not depend on WordPress plugin updates. Use application-level cache only if you cannot configure server-level cache (shared hosting).

Server Cache Configuration for Quad-100 WordPress — Nginx, LiteSpeed & Varnish

18 min read

17 Mar 2026

Artur Ferreira

Technical Guides

About the Author

Artur Ferreira is the founder of The GEO Lab. He developed the GEO Stack framework and leads research into Generative Engine Optimisation methodologies. Connect on X/Twitter or LinkedIn.

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