[Bug 1943639] Re: project/instances/attach_interface has O(N) scaling time complexity for opening form

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** Tags added: patch

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https://bugs.launchpad.net/bugs/1943639

Title:
  project/instances/attach_interface has O(N) scaling time complexity
  for opening form

Status in OpenStack Dashboard (Horizon):
  Fix Released
Status in horizon package in Ubuntu:
  New
Status in horizon source package in Focal:
  New

Bug description:
  The time complexity of opening the project/instances/attach_interface
  form box is O(N) where N is the number of networks in the project.
  This is due to

  https://opendev.org/openstack/horizon/src/branch/master/openstack_dashboard/dashboards/project/instances/utils.py#L210

  Which loops over the networks and requests the ports associated with
  the network. For large projects this scaling behavior can become
  prohibitive.

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