diff --git a/src/backend/replication/walsender.c b/src/backend/replication/walsender.c
index 77c8baa32a..c897ef4c60 100644
--- a/src/backend/replication/walsender.c
+++ b/src/backend/replication/walsender.c
@@ -2699,6 +2699,8 @@ WalSndLoop(WalSndSendDataCallback send_data)
 			!pq_is_send_pending())
 			break;
 
+		pg_usleep(10000);
+
 		/*
 		 * If we don't have any pending data in the output buffer, try to send
 		 * some more.  If there is some, we don't bother to call send_data