Comment 9 for bug 1808010

Bug 1567655 would also be related to performance issues in the nova metadata-api because when using neutron, the metadata API has to query security group information from neutron per instance:

https://github.com/openstack/nova/blob/c72dafad8011198b78fd906f2fc7d1126e3f79f3/nova/api/metadata/base.py#L147

If nova were to cache the security group information with the instance in the instance_info_caches table we wouldn't need to query the neutron API.