WordPress Object Caching Explained

Object caching stores reusable query and application results. It solves a different problem from full-page caching.

What an object cache stores

WordPress repeatedly requests options, query results and computed data while building pages. A persistent object cache can reuse some of that work between requests.

Page cache versus object cache

A full-page cache can bypass much of WordPress for public pages. An object cache remains useful for dynamic requests that still execute WordPress, such as logged-in or personalized experiences.

Redis and Memcached

Managed hosts often expose persistent object caching through technologies such as Redis or Memcached. Configuration belongs close to the hosting layer, and availability varies by provider.

When it helps most

Stores, membership sites and busy administrative dashboards can benefit when they cannot rely entirely on public-page caching.

Measure the database workload

Object caching is not a substitute for fixing pathological queries. Use application monitoring or query profiling when the database remains slow.