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How does caching work in Drupal?
Drupal’s page cache stores the fully rendered HTML of each page that it’s required to cache. It does this using a cache ID ( cid ) that corresponds to the actual URL used to request the page. Because the URL is the cid , URIs that map to the same logic are cached as different items in the Drupal page cache.
Does Drupal Cron clear cache?
If you have not already set up Drupal’s cron routine, please see this article for information about how to do so. Clearing Drupal’s caches. You can do this manually, and you can also set up a dedicated cron job so caches are cleared automatically.
What is Drupal Cron?
Cron is a time-based task scheduler that can be configured to automatically execute tasks without any manual involvement beyond the initial configuration. Cron will always run unless all jobs are specifically set to ‘Off’ via Elysia or Ultimate Cron modules. You can configure when and how often cron executes the tasks.
What to do if your Drupal site is not cached?
Without it, your Drupal site will have to rebuild every page and the Pantheon Global CDN will not cache your site. If possible, enable “Cache blocks” as well to increase performance for logged-in users. Minimum caching lifetime forces cached content to continue to exist before it can be flushed.
Why does Drupal use aggressive mode when cached?
This is because when Drupal uses Aggressive mode no logic is executed on a successful cache hit. As soon as the CMS detects that the URL being request has a cache, it returns that cache. Obviously, when the page is cached Externally in a reverse-proxy layer, Drupal is not consulted when cached pages are delivered.
How to use caching to improve Drupal performance?
Drupal offers basic performance tuning at: Administration > Configuration > Development > Performance (admin/config/development/performance) It is recommended that block and page caching be enabled. Instead of Drupal dynamically performing complex SQL queries it caches these for quick retrieval.
What are the performance settings for Drupal 7?
The Drupal 7 version of the module depends upon the Drupal 8 Cache Backport module. Visit /admin/config/development/performance for Drupal’s performance settings. Unless needed for development, you should always enable “Cache pages for anonymous users”.