Your caching plugins are fighting for control. When two caching plugins try to serve cached pages simultaneously, they create conflicts that break layouts, serve stale content, and — ironically — slow your site down.

Why This Matters

Caching plugins work by intercepting page requests and serving pre-built HTML instead of running PHP on every visit. When two plugins both try to do this:

  • Double-cached pages — one plugin caches the other's cached output, creating stale layers
  • Broken CSS/JS — both plugins try to minify and combine assets, resulting in missing styles or broken scripts
  • Cache invalidation failures — when you update a post, one plugin clears its cache but the other still serves the old version
  • .htaccess conflicts — both write rewrite rules that can break your site entirely
  • Increased server load — instead of reducing load, two caching systems consume more memory and CPU

Common Conflicting Pairs

Plugin A Plugin B Why It Conflicts
WP Rocket LiteSpeed Cache Both do full-page caching + asset optimization
WP Super Cache W3 Total Cache Both write to .htaccess and /wp-content/cache/
WP Rocket Autoptimize Overlapping CSS/JS minification and concatenation
Any cache plugin NitroPack NitroPack intercepts at CDN level, local cache is redundant
SG Optimizer WP Rocket SG Optimizer is designed for SiteGround's server stack

How to Fix It

Safe Practice: Before making any technical changes, ensure you have a full backup of your site (files and database) via your hosting control panel or a dedicated plugin like UpdraftPlus.

Step 1: Identify What Each Plugin Does

Not all "performance" plugins are full caching plugins. Some do specific things:

  • Full-page caching: WP Rocket, LiteSpeed Cache, WP Super Cache, W3 Total Cache
  • Asset optimization only: Autoptimize, Asset CleanUp, Perfmatters
  • CDN-level caching: NitroPack, Cloudflare APO, Flying Press

You need one full-page caching solution. Asset optimizers can sometimes coexist if configured carefully, but it's usually better to let your main caching plugin handle everything.

Step 2: Choose Based on Your Hosting

Your hosting environment determines the best caching plugin:

Hosting Recommended Plugin Why
LiteSpeed server LiteSpeed Cache Built for the server, free, unmatched integration
SiteGround SG Optimizer Designed for their stack
Cloudways Breeze Pre-installed, integrated with Varnish
Any shared hosting WP Super Cache Lightweight, minimal server requirements
Any hosting (paid) WP Rocket Best UI, most features, works everywhere

Step 3: Clean Deactivation

Don't just deactivate the extra plugin — clean up after it:

  1. Go to the plugin's settings and look for a "Clear/Purge All Cache" button. Click it.
  2. If the plugin has a removal/uninstall option (WP Rocket has "Remove All WP Rocket Data"), use it.
  3. Deactivate the plugin in Plugins → Installed Plugins.
  4. Delete the plugin.
  5. Check your .htaccess file — make sure no leftover rewrite rules remain.

Step 4: Configure Your Remaining Plugin

With one caching plugin active, configure it properly:

  • Enable page caching (the main performance boost)
  • Enable browser caching (tells browsers to store static files locally)
  • Enable GZIP/Brotli compression (reduces file sizes)
  • Be careful with CSS/JS minification — test your frontend after enabling it

Step 5: Test Your Site

After consolidating:

  1. Visit your site in an incognito/private window
  2. Check that all pages load correctly (no broken layouts)
  3. Run a speed test at PageSpeed Insights or GTmetrix
  4. Check response headers — you should see cache headers from only one plugin

What to Watch For

  • Cloudflare or CDN caching is separate from WordPress caching. You can use Cloudflare alongside one WP caching plugin — just make sure they're not both trying to minify assets.
  • Object caching (Redis, Memcached) is different from page caching. A Redis object cache plugin works alongside (not against) a page cache plugin.
  • After deleting a cache plugin, your site may be temporarily slower until the remaining plugin rebuilds its cache. This is normal — give it a few hours.
  • If your site breaks after deactivating a cache plugin, it's usually a leftover .htaccess rule. Compare your .htaccess with the WordPress default.