By https://github.com/owncloud/core/blob/master/settings/admin.php#L55 all groups are loaded. On bigger LDAP setups (my test setup here > 7k groups) this will lead to long loading times.

To reproduce:

1. create a huge amount of groups (preferably with LDAP)
2. open admin page

cc @schiesbn