Page Cache

Abuse Drupal Best Practices at your own peril: Poor Performance

In the Drupal community, we always recommend using the Drupal API, and best practices for development, management and deployment. This is for many reasons, including modularity, security and maintainability.

But it is also for performance that you need to stick to these guidelines, refined for many years by so many in the community.

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Beware of Drupal modules that disable the page cache

When doing performance assessment for large and complex sites to assess why they are not fast or scalable, we often run into cases where modules intentionally disable the Drupal page cache.

Depending on how often it happens and for which pages, disabling the page cache can negatively impact the site's performance, be that in scalability, or speed of serving pages.

How to inspect code for page cache disabling

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Remember that the CAPTCHA module disables page caching

By design, the Drupal CAPTCHA module disables page caching for pages it is enabled on.

So if you enable CAPTCHA for user login and/or registration forms, those pages will not be cached. This is often acceptable.

However, if you enable CAPTCHA for comments, and have the comment form visible at the bottom of each node, then a big portion of your site's pages will not be cached in the page cache at all.

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