WordPress performance is often optimized at the surface level through page caching, CDN usage, and asset optimization. WordPress site owners are struggling with the DB resource usage. A single product page generates 500+ DB queries (mostly initiated by Elementor & WooCommerce). Proper object caching can save a lot of DB resources. One of the most powerful but less understood layers is object caching.
In this talk, I will explain how WordPress object caching works internally, including the wp_cache API, cache groups, and the role of the object-cache.php drop-in. I will also break down how WordPress handles cache storage in memory by default and how it can be extended into persistent systems like Redis or Memcached to significantly reduce database load and improve scalability.
I will share how requests flow through the caching layer, where cache hits and misses occur, and how proper caching strategies can dramatically improve performance in real-world applications. I will also highlight common mistakes such as poor cache key design, unnecessary invalidation, and misunderstanding when object caching actually helps.
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