diff --git a/openstackclient/api/object_store_v1.py b/openstackclient/api/object_store_v1.py
index 184814c61..74c4a46f2 100644
--- a/openstackclient/api/object_store_v1.py
+++ b/openstackclient/api/object_store_v1.py
@@ -380,7 +380,7 @@ class APIv1(api.BaseAPI):
                 if len(os.path.dirname(file)) > 0:
                     os.makedirs(os.path.dirname(file))
             with open(file, 'wb') as f:
-                for chunk in response.iter_content():
+                for chunk in response.iter_content(64 * 1024):
                     f.write(chunk)
 
     def object_set(
diff --git a/releasenotes/notes/speedup-object-save-6bd59e678a31c3e8.yaml b/releasenotes/notes/speedup-object-save-6bd59e678a31c3e8.yaml
new file mode 100644
index 000000000..b7ad09402
--- /dev/null
+++ b/releasenotes/notes/speedup-object-save-6bd59e678a31c3e8.yaml
@@ -0,0 +1,5 @@
+---
+fixes:
+  - |
+     Makes ``openstack object save`` much faster when saving an object to disk.
+     [Bug `1654645 <https://bugs.launchpad.net/bugs/1654645>`_]