Issue #2482295 by Berdir: Rebuilding field map with many bundles/fields is very slow

core/core.services.yml

...ore/Entity/DynamicallyFieldableEntityStorageInterface.php

core/lib/Drupal/Core/Entity/EntityManager.php

core/lib/Drupal/Core/Entity/EntityManagerInterface.php

...ib/Drupal/Core/Field/FieldDefinitionListenerInterface.php

core/modules/field/src/Entity/FieldConfig.php

...modules/system/src/Tests/Entity/EntityBundleFieldTest.php

...ests/modules/entity_schema_test/entity_schema_test.module

core/tests/Drupal/Tests/Core/Entity/EntityManagerTest.php