Speed up WordPress with caching

Step 1 Open the Caching tab

Open the site and click Caching. It has four cards: Page cache, Nuvlo plugin, Object cache and Database memory.

Step 2 Clear the page cache

The page cache keeps ready-made copies of pages, so visitors who aren’t logged in get them without WordPress running. Nginx sites use Nginx FastCGI cache, OpenLiteSpeed sites LiteSpeed Cache.

If a change doesn’t show up, click Clear page cache. With the Nuvlo plugin active, changed pages clear by themselves. See Use the Nuvlo plugins for WordPress.

Step 3 Size the object cache

The object cache is a private Redis cache that stores database results, so pages are built faster. It shows Allocated, In use, Hit rate and Evictions.

• Automatic grows under load and shrinks after 24 quiet hours. Set Smallest size (32 to 256 MB) and Largest size (64 MB to 1 GB).
• Fixed always uses the Size you pick, 32 MB to 1 GB.

Many Evictions mean the cache runs out of memory. Raise the largest size, or choose a bigger fixed size. Click Save object cache.

Step 4 Give the database more memory

Database memory is what MariaDB keeps for this site’s data, so pages read less from disk. The card shows Set to, Running with and Available here: what the server has set aside for databases, minus what its other sites use.

Pick a Size and click Save database memory. If the running database can’t grow that far, the button says Save and restart the database. The site shows a database error while it restarts.