The cache system in Drupal 9 delivers the API with the elements required for creation, storage and invalidation of cached data.  Drupal is structured so initially data is stored in the database.  Whereas, files are stored in the following directories: sites/default/files/css sites/default/files/js sites/default/files/phpFocusing on database storage, from a performance perspective the default cache is managed via the admin interface admin/config/development/performanceOn this page,...