Drupal Starter Kits uses a strong caching technique to improve site performance. Acquia reinvents the run-time architecture of CMS with caching at all layers of the digital stack. Drupal Starter Kits ships with the Acquia Purge module along with the default caching techniques that Drupal core provides.
Acquia Purge module
This module is shipped with Drupal Starter Kits. It invalidates cached content on Acquia Cloud and allows you to set time-to-live (TTL) to a high value like a year. It makes your site more resilient, puts less load on the stack, and improves site performance.
After installing Drupal Starter Kits, you can view the configuration at <Your Acquia CMS FQDN>/admin/config/development/performance/purge. You can also override the purge configuration from this page.
Internal dynamic page cache module
This module caches pages for all users, including the dynamic content. By default, this module is disabled in Drupal Starter Kits.
Internal Page cache module
This module caches pages for anonymous users and can be used when the external page cache is not available. By default, this module is disabled in Drupal Starter Kits.