How to Speed Up Your WordPress Site with Redis Object Cache

Does your WordPress or WooCommerce site feel slow? The problem is likely too many database queries. Every time a visitor loads a page, WordPress fetches data from the database, which can slow things down.

The solution? Redis Object Caching!

With Redis, your database queries are stored in memory, making your website load much faster while reducing server load.

Step 1: Install Redis on Your Server

First, we need to install Redis on the server.

For cPanel/WHM Users (CentOS/AlmaLinux/Rocky Linux)

Connect to your server using SSH and run:

yum install redis -y
systemctl enable redis
systemctl start redis

This will:

✔ Install Redis
✔ Enable it to start on boot
✔ Start Redis immediately

To check if Redis is running, run:

systemctl status redis

You should see “active (running)” in green.

Step 2: Install Redis Object Cache Plugin in WordPress

Now, we need to connect WordPress to Redis.

Go to WordPress Admin > Plugins > Add New
Search for Redis Object Cache (by Till Krüss)
Click Install Now and then Activate

Once activated, go to Settings > Redis and click Enable Object Cache.

✅ Redis should now show “Connected” status!

Step 3: Verify Redis is Working

Option 1: Use the Plugin Dashboard

Go to Settings > Redis
Check if Cache Hits are increasing. If so, Redis is working! ✅

Option 2: Test via SSH

Run this command in SSH:

redis-cli ping

If Redis is working, you’ll see:

PONG

You can also check Redis memory usage:

redis-cli info memory

Step 4: Optimize Redis for WooCommerce

Since WooCommerce is dynamic, we need to optimize Redis to ensure fast checkout and cart updates.

Exclude Cart & Checkout from Cache

Go to WP Rocket > Advanced Rules
Add /cart/, /checkout/, and /my-account/ to the cache exclusion list.

Modify Redis Configuration

Edit the Redis configuration file:

nano /etc/redis.conf

Find and update:

maxmemory 512mb
maxmemory-policy allkeys-lru

Then restart Redis:

systemctl restart redis

Step 5: Final Performance Check

After setting up Redis, your site should be noticeably faster!

Test your TTFB (Time To First Byte):

curl -o /dev/null -s -w "%{time_starttransfer}\n" https://yourwebsite.com

✅ If your TTFB is under 200ms, Redis is working perfectly!

Final Thoughts

Redis Object Cache is one of the best ways to speed up WooCommerce stores, especially if your site has a lot of products or customers.

What You Gained Today:

✔ Faster Page Load Times
✔ Reduced Database Load
✔ Improved WooCommerce Checkout Performance
✔ Better Server Scalability

Bonus Tip: Combine Redis with Cloudflare CDN and WP Rocket for even faster speeds!