diff --git a/changelogs/fragments/458-rshm_repository-reduce_execution_time_when_changed_is_false.yml b/changelogs/fragments/458-rshm_repository-reduce_execution_time_when_changed_is_false.yml
new file mode 100644
index 0000000000..3cfd53f503
--- /dev/null
+++ b/changelogs/fragments/458-rshm_repository-reduce_execution_time_when_changed_is_false.yml
@@ -0,0 +1,3 @@
+bugfixes:
+  - rshm_repository - reduce execution time when changed is False
+    (https://github.com/ansible-collections/community.general/pull/458).
diff --git a/plugins/modules/packaging/os/rhsm_repository.py b/plugins/modules/packaging/os/rhsm_repository.py
index 7d445e9d2e..505c6c94b6 100644
--- a/plugins/modules/packaging/os/rhsm_repository.py
+++ b/plugins/modules/packaging/os/rhsm_repository.py
@@ -217,7 +217,7 @@ def repository_modify(module, state, name, purge=False):
             'before_header': "RHSM repositories",
             'after_header': "RHSM repositories"}
 
-    if not module.check_mode:
+    if not module.check_mode and changed:
         rc, out, err = run_subscription_manager(module, rhsm_arguments)
         results = out.splitlines()
     module.exit_json(results=results, changed=changed, repositories=updated_repo_list, diff=diff)