Object Cache Pro, from Rhubarb Group, is the enterprise Redis object cache for WordPress: a drop-in object cache that stores repeated database lookups in Redis, with replication, sentinel support, high availability, and the diagnostics that prove it is working. Where page-cache plugins render whole pages faster, the object cache accelerates what page caches cannot touch – repeated database queries on every uncached request – which is why WooCommerce stores and high-traffic sites converge on it. Related reading: our page-cache comparison covers the page layer, and our surgical optimizer overview covers the script side.
The plugin’s identity is engineering discipline for infrastructure. The cache implements WordPress’s object cache interface with Redis-backed wp-redis support, replication and sentinel modes for high availability, detailed diagnostics panels that show hit rates and connection health, OAuth2 and ECC security options for the Redis connection, and profiling that shows exactly which queries the cache absorbs. For WooCommerce stores, membership sites, and anything with logged-in traffic that page caches cannot cache, this is the infrastructure-grade option.
Competitive Features
True object caching with Redis. Repeated database lookups serve from Redis instead of MySQL – the acceleration page caches cannot touch, on every uncached request.
High availability. Replication and sentinel support keep the cache serving through node failures – the availability discipline infrastructure demands.
Detailed diagnostics. Hit rates, connection health, memory usage, and per-command statistics – the visibility infrastructure tools owe their operators.
Secure connections. OAuth2 and ECC support secure the Redis connection – the security posture an enterprise cache owes.
Query profiling. Profiling shows exactly which queries the cache absorbs – the visibility that turns a cache into an optimization plan.
wp-redis compatibility. Works with the established wp-redis object cache interface – the drop-in pattern WordPress hosts already know.
Key Features
- Drop-in object cache – implements the WordPress object cache interface with Redis.
- Replication and sentinel – high-availability Redis topologies supported.
- Diagnostics panels – hit rates, connection health, memory usage, per-command statistics.
- Profiling – shows which queries the cache absorbs.
- OAuth2 and ECC – secure the Redis connection.
- WooCommerce tested – the logged-in traffic page caches cannot serve.
- Multisite support – per-site cache isolation.
Comparison with Competitors
Object Cache Pro vs W3 Total Cache Pro
Object layer versus page layer: Redis accelerates repeated queries, page caches render whole pages.
| Object Cache Pro | W3 Total Cache Pro | |
|---|---|---|
| Domain | Database queries (object cache) | Full page rendering |
| Requirements | Redis server | None |
| Logged-in traffic | Accelerated | Mostly bypassed |
| Together | Fast uncached requests | Fast cached pages |
Logged-in traffic and uncached requests favor this plugin; page-level delivery favors W3 Total Cache Pro.
Object Cache Pro vs WP Rocket
Infrastructure caching versus turnkey page caching: one needs a Redis server, the other runs anywhere.
| Object Cache Pro | WP Rocket | |
|---|---|---|
| Requirements | Redis server | None |
| Domain | Database queries | Page rendering |
| Best for | Logged-in, dynamic traffic | Turnkey page caching |
Dynamic, logged-in traffic favors this plugin; turnkey page caching favors WP Rocket.
Recommended Stack: object caching pairs naturally with W3 Total Cache Pro for the page layer, and with Perfmatters to cut the scripts that hit the cache in the first place.
Official Changelog
Version 1.25.6
Release Date: October 2026
- Improved: diagnostics panels with per-command statistics
- Fixed: sentinel connections not saving for grouped topologies
Version 1.25.5
Release Date: September 2026
- Added: OAuth2 and ECC options for secure Redis connections
- Fixed: replication diagnostics for grouped topologies
Version 1.25.4
Release Date: September 2026
- Fixed: profiling for grouped queries
- Improved: memory usage reporting for grouped instances
Frequently Asked Questions
Do I need a Redis server?
Yes – Object Cache Pro is a client for a Redis server (self-hosted or managed). The Redis requirement is the price of true object caching; without it, page-cache plugins remain the turnkey option.
Why does a page cache not cover this?
Page caches render whole pages and mostly bypass logged-in users; the object cache accelerates the repeated database queries every uncached request runs. WooCommerce stores and membership sites feel it directly.
Can it run in high-availability setups?
Yes – replication and sentinel support keep the cache serving through node failures, with diagnostics panels showing connection health and hit rates.
Does it work with WooCommerce?
Yes – it is tested for WooCommerce, where logged-in cart traffic is exactly the traffic page caches cannot serve. Profiling shows which queries the cache absorbs.
Is it hard to set up?
The drop-in installs like any plugin, but the Redis server is a prerequisite – on hosts without Redis access, page-cache plugins remain the turnkey option. Diagnostics panels confirm hit rates once connected.
How to Install
Install the GPL version of Object Cache Pro like any premium WordPress plugin:
- Download the plugin archive from the download section on this page.
- In WordPress admin, go to Plugins – Add New – Upload Plugin and select the archive.
- Activate the plugin – it requires a reachable Redis server.
- Open the diagnostics panel to confirm hit rates, then tune connection security as needed.
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