Object caching stores the result of expensive database queries in memory. For WordPress sites that repeatedly ask the database for the same information, Redis can reduce database work.
Page Cache Versus Object Cache
Page caching stores full HTML pages. Object caching stores smaller data objects used while building a page. They solve different problems and can be used together.
When Redis Helps
Redis can help dynamic sites, logged-in areas, shops, membership sites, and admin-heavy workflows. It is less dramatic on a small static brochure site with good page caching.
WordPress Setup
Enable Redis where your hosting plan supports it, then connect WordPress using a compatible object cache plugin. Check the plugin status page to confirm it is connected.
Watch Compatibility
If a site behaves strangely after enabling object cache, clear the cache first. Some plugins need exclusions or configuration changes.
Redis is not a cure for a badly built site, but it can be a useful layer for the right workload.
