Object Caching stores the results of database queries in memory (Redis), so repeated queries return instantly rather than hitting the database. This especially helps logged-in users and dynamic pages that can’t benefit from page caching.
Toggling this on:
- Installs the bundled Redis Object Cache dropin (
wp-content/object-cache.php). - All database queries are cached in Redis automatically. No code changes required.
If Redis is unreachable for any reason, the site falls back gracefully — visitors see no errors, queries just run against the database normally.
Object caching will be disabled if any of the following are found:
- The
phpredisPHP extension is not installed on the server. - A third-party
object-cache.phpdropin is already present. - A conflicting plugin is active: Redis Object Cache, Object Cache Pro, Docket Cache, Memcached Object Cache, Memcached Redux, W3 Total Cache, or LiteSpeed Cache.
Toggling this off removes the dropin. Only removes it if it was installed by PMPro Hosting — will not touch a third-party dropin.
Object cache is flushed as part of Clear All Caches in the Tools tab.
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Last updated on March 26, 2026
