EntityFilters.Attributes took more time than EntityFilters.Entity to fetch entity metadata.

Hi All,

I am using Dynamics CRM server 2016.

I want to find out alternate keys for all entities.

Please see two code snippet as below.

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Code snippet [1].

RetrieveAllEntitiesRequest request = new RetrieveAllEntitiesRequest()
{
     EntityFilters = EntityFilters.Attributes,
     RetrieveAsIfPublished = true
};

RetrieveAllEntitiesResponse response = (RetrieveAllEntitiesResponse)serviceProxy.Execute(request);

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Code snippet [2].

RetrieveAllEntitiesRequestrequest = new RetrieveAllEntitiesRequest()
{
    EntityFilters = EntityFilters.Entity ,
     RetrieveAsIfPublished = true
};

RetrieveAllEntitiesResponse response = (RetrieveAllEntitiesResponse)serviceProxy.Execute(request);

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I observed that,

- By using Code snippet [2], server respond in very less time but did not retrieve  information for alternate keys.

- When i used Code snippet [1] , server took more time to respond and it successfully retrieved  information for alternate keys.

I want to know that, is there any way to find alternate keys for all entities in less time?