How to Configure Redis Object Cache in WordPress (LSCache)

Page Cache vs Object Cache

You've likely installed a caching plugin before. Plugins like WP Rocket or LiteSpeed Cache provide Page Caching—meaning they take the final HTML output of a webpage and save it. However, page caching is bypassed when:

1. A user is logged in.
2. A customer is checking out on WooCommerce.
3. The cart widget needs dynamic updating.

When Page Caching is bypassed, WordPress slams your Database. That's where Object Caching (Redis) comes in.

Step 1: Install the Redis Server

If you are on an Unmanaged VPS (Ubuntu 22/24), you must install the Redis server application first.

sudo apt update
sudo apt install redis-server -y

Enable Redis to start on boot:

sudo systemctl enable redis-server
sudo systemctl start redis-server

(Note: If you use AmanaFlow cPanel/CyberPanel hosting, Redis is usually pre-installed and available with 1-click).

Step 2: Configure Redis Memory (Optional but Recommended)

By default, Redis might consume all your RAM if not limited. Edit /etc/redis/redis.conf:

maxmemory 256mb
maxmemory-policy allkeys-lru

Restart Redis after applying.

Step 3: Connect WordPress via LiteSpeed Cache

We highly recommend using the free LiteSpeed Cache (LSCache) plugin over the default "Redis Object Cache" plugin for better server-level integration.

1. In your WordPress Dashboard, go to LiteSpeed Cache > Cache > Object.
2. Turn Object Cache to ON.
3. Method: Redis.
4. Host: 127.0.0.1
5. Port: 6379
6. Click Save Changes.

Refresh the page. You should now see a green "Connection Test: Passed" message.

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Measuring the Impact

After enabling Redis on a standard WooCommerce store:

• Admin Dashboard Speed: Product catalog loads will decrease from ~2 seconds to ~300ms.
• CPU Usage: Server CPU loads will drop significantly because MySQL is handling 80% fewer repetitive queries.

FAQs

Q: Can I share one Redis instance across multiple WordPress sites?
A: Yes, but you MUST assign a different Global Group or Site ID prefix in the LiteSpeed Cache settings for each website. Otherwise, users will see data belonging to other websites!