The Cache Management page lets you review and control the available caches for a website environment. You can clear individual cache types, clear all active caches, manage the Persistent Object Cache, or purge specific URL paths without clearing the entire Page Cache.

Accessing the Cache Management page

  1. Log in to the Pressidium Dashboard.
  2. Select the website you want to manage.
  3. Select Production or Staging.
  4. Go to Cache.
  5. Open the Cache Management tab.

Included Sections

  • Page Cache – shows Page Cache status and provides a clear action
  • CDN Cache – shows CDN Cache status and provides a clear action when available
  • Persistent Object Cache (Redis) – shows object-cache status and provides enable, disable, and clear controls
  • All Cache – clears all active caches for the website
  • Purge URLs from Page Cache – removes selected paths from Page Cache

Page Cache

Page caching is a key feature in our platform, and it significantly enhances website performance and speed by storing and serving a copy of the full page response generated by a website from memory (or a super fast SSD).

At Pressidium, full page caching is implemented in at least two caching layers, “hot” and “warm“. These layers are part of our adaptive cache engine and work in tandem based on your website’s caching profile to ensure optimal website performance.

  • Hot cache serves data from memory for quick retrieval and reduced latency.
  • Warm Cache serves data that reside in state-of-the-art super fast SSD disks and is used for data that is accessed less frequently but still requires rapid access when needed.

Page cache provides significant benefits:

  • Faster Page Loading: Cached pages load significantly faster because they eliminate the need to re-run complex PHP scripts and database queries for every visitor.
  • Reduced Infrastructure Load: Since cached pages are served without the underlying infrastructure having to regenerate them, it reduces the server’s processing load, allowing it to handle more concurrent visitors.
  • Improved Scalability: Our caching engine enables websites to handle traffic spikes and high visitor loads transparently and more efficiently.
  • Better User Experience: Faster loading times lead to improved user satisfaction and reduced bounce rates.

How to clear page cache

Our page caching mechanism is deeply integrated with WordPress and, by default, will automatically clear the page cache for several URLs (e.g. homepage, single post/page URL, page archives, etc.) when a post or page is created or updated.

But, there are occasions when you may find it necessary to manually clear the cache, such as when you update content or make changes to your website, either through the WordPress admin interface or by updating files via SFTP.

To clear page cache only:

  • Navigate to Cache -> Cache Management screen.
  • Locate the Page Cache section.
  • Click Clear and again Clear on the confirmation dialog box.

A background job will be started to clear the website’s full page cache.

CDN Cache

The CDN Cache section applies to production websites using the Pressidium Advanced Network.

When the CDN service is enabled, static assets such as images, CSS, and JavaScript files are cached and served from CDN edge locations closer to visitors. This reduces requests to the origin and improves delivery speed and latency.

You may need to clear the CDN cache after modifying or replacing static files so the CDN can retrieve and cache the updated versions.

CDN Cache is not available in staging environments. Its cache controls apply only to production.

How to clear the CDN cache

  1. Navigate to Cache -> Cache Management screen.
  2. Locate the CDN Cache section.

Click Clear and confirm the action to start a background job to clear the CDN cache.

Persistent Object Cache

WordPress uses an object cache to temporarily store frequently accessed data during a request, reducing repeated database work.

By default, this cache does not persist between separate requests. A Persistent Object Cache allows eligible cached data to remain available across requests, reducing repeated database queries and other expensive operations.

Pressidium, out of the box, provides a Persistent Object Cache backed by Redis, an in-memory key/value store. WordPress core, plugins, and themes can use this cache through the WordPress Object Cache and compatible APIs.

Persistent Object Cache can be particularly useful for database-intensive websites, but the performance benefit depends on the website’s workload, plugins, themes, and data-access patterns.

What to know before managing the Persistent Object Cache

Persistent Object Cache is not enabled by default.

Before enabling it, verify that your plugins and themes are compatible with the WordPress Object Cache. If possible, test the website’s behavior on a clone before enabling Persistent Object Cache on your production website.

Persistent Object Cache can improve performance, but some workloads may see limited benefit or, in some cases, reduced performance.

Potential causes include:

  • A large amount of autoloaded option data.
  • Very large cached options, transients, or other cached objects.
  • Plugins or themes that perform excessive object-cache reads and writes during a single request.
  • Workloads that generate or invalidate cached data so frequently that little data can be reused between requests.

Additional resources: WordPress Object Cache reference

How to enable, disable or clear Object Cache

To enable oir disable Object Cache, navigate to Cache > Cache Management to locate the Persistent Object Cache section.

Toggle the respective setting to ON (or OFF), and then confirm in the confirmation dialog.

A background job starts to update the cache configuration. You will receive a Dashboard notification when the operation is complete.

To clear all entries from the Persistent Object Cache, just click Clear and confirm the action to start a background job to clear the object cache.

How to Clear / Purge Object Cache from WP admin

You can also clear the Object Cache from the Pressidium panel in WordPress Admin:

  1. Open Pressidium from the WordPress Admin sidebar.
  2. Go to Adaptive Caching.
  3. Locate the Cache Control section.
  4. Click Purge WP Object Cache.

A background job starts to clear the object cache.

All Cache

You can clear all caches in several ways.

1. Using the Cache page section

To clear all caches (this includes the full page cache):

  1. Navigate to Cache -> Cache Management screen.
  2. Locate the All Cache section.

Click Clear All and again Clear on the confirmation dialog box.

A background operation will start. When it is complete, a notification appears in the sidebar.

2. Using the Production Operations menu

  1. Click on the Production operations button on the navigation bar to display the related drop-down menu.
  2. Click the Clear cache menu item, a confirmation dialog is displayed.

Finally, confirm the action by clicking Clear on the confirmation dialog box.

A background operation will start. When it is complete, a notification appears in the sidebar.

3. Using the WordPress Admin Dashboard

  1. Login to your WordPress admin dashboard.
  2. Click on the Pressidium sidebar menu to open up the Pressidium platform settings.
  3. Click the Adaptive Caching tab to go to the Cache settings screen.
  4. Click the Purge All Caches button to clear the page cache and WordPress own object cache.

Expected outcome

The existing cached versions of your site’s content are removed.
New requests generate fresh responses, which are then cached again according to your site’s cache configuration.

Verification

After the cache purge is complete:

  1. Open the affected page in a private or incognito browser window.
  2. Reload the page.
  3. Confirm that the latest content or design changes are visible.

When using the Pressidium Dashboard, also confirm that the cache-clearing operation shows as completed in the notification panel.

4. Do it programmatically

You can also control and customize the cache clear behavior programmatically, by using the methods exposed by the Pressidium MU plugin:

https://help.pressidium.com/managed-wordpress-hosting/website-management/cache-management/purging-additional-paths-when-clearing-cache

Purge URLs from Page Cache

In this section, you can select to clear one or more URLs from the page cache. This is useful when you are making changes to a specific set of pages or files and don’t need to clear the whole cache.

  1. Navigate to Cache -> Cache Management screen.
  2. Locate the Purge URLs from Page Cache section.

Insert the URL path you want to exclude in the input box and click Purge.

Example: /en/my-custom-cart-page

A background job will start to clear the page cache for the specific URLs. You will receive a Dashboard notification as soon as the process is finished.

You can also use the + button when you need to purge more than one URL.

You can add up to 3 URLs at a time.

Common issues and solutions

Updated content is still not visible

Check whether:

  • You cleared the cache type that contains the affected content.
  • The correct website environment was selected.
  • The affected URL path was entered correctly.
  • For websites using the Pressidium Advanced Network, a modified static file may also require the CDN Cache to be cleared.
  • Your browser is displaying a locally cached copy.

Test the affected page in a private or incognito browser window.

A purged URL still shows old content

Confirm that the path begins with / and matches the affected page.

If the website uses the Pressidium Advanced Network and the change includes CSS, JavaScript, images, fonts, or other static assets, also clear the CDN Cache.

Persistent Object Cache causes unexpected behavior

Disable the Persistent Object Cache and test the website again.

Review recent plugin or theme changes and verify that they support the WordPress Object Cache before re-enabling it.

A cache operation does not complete

Check the notification panel for the operation status.

If the operation remains pending or fails, contact Support with the affected domain, environment, cache action, and approximate time the operation started.

Need help?

Contact Support if:

  • A cache operation fails or remains pending.
  • Updated content is still not visible after clearing the applicable caches.
  • You are unsure which cache type to clear.
  • Persistent Object Cache causes unexpected behavior.
  • Purging a specific URL does not produce the expected result.

Include:

  • The affected domain
  • The selected environment
  • The affected URL
  • The cache action you used
  • The expected result
  • The actual result
  • The approximate timestamp and timezone
  • A screenshot of the operation or notification

Where to go next

  • Open Cache Exclusions to manage URL- and cookie-based exclusions.
  • To check the cache status of a specific request, follow Identifying Cache Behavior Using HTTP Headers. The guide explains how to inspect headers such as X-Cache using browser Developer Tools or an HTTP client such as curl.
  • You can get insights on how the Caching engine is performing with your website and whether there is content that is excluded from caching, bypassing the cache engine directly from the Dashboard using our fully integrated Analytics suite.