Why editing a storage domain is taking around 1-2 minute in an environment with large number of LUNs

Issue

• While extending a storage domain using Edit or Manage domain button, it's taking around 1-2 minute to get the edit window screen which lists the LUNs and its information.
• The issue happens in the environment containing a large number of LUNs and it finishes within few seconds in an environment with a very less number of LUNs.