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Imagine you are at a restaurant. Every order means the waiter runs to the kitchen. That is WordPress without object cache.
Now imagine the waiter remembers popular orders. Coffee for table 5? Already memorized. That is object cache in action.
What Gets Cached?
- Database queries: Post lookups, user data, settings
- Transients: Temporary plugin data
- Options: Site configuration
- Postmeta: Custom fields
Real result: 185 queries becomes 12. Query time drops from 1200ms to 45ms.
How to Enable Object Cache
Quality managed hosts enable it automatically:
- Rocket.net: Redis included
- Kinsta: Memcached included
- Cloudways: Available, manual activation
Or add to wp-config.php:
define('WP_CACHE', true);Checking If It Works
Install Query Monitor plugin. Check Object Cache tab. Hit ratio above 80% = working well.
Full guide: wpvelocitylab.com/object-cache-explained