specify ubuntu user, ansible performance tweaks
diff --git a/ansible.cfg b/ansible.cfg
index 090a37d..7ee9c04 100644
--- a/ansible.cfg
+++ b/ansible.cfg
@@ -3,3 +3,6 @@
 
 [defaults]
 callback_whitelist = profile_tasks
+host_key_checking = false
+forks=20
+