Code Review - Performance Impact - Assign security roles to users in bulk

[bipinshan]

Hello Experts,

I use below code to assign security role to a single user.

public static void AssignSecurityRole(Guid guidSystemUserId, Guid guidSecurityRoleId, IOrganizationService crmService)
        {
            
            // Create new Associate Request object for creating a N:N relationsip between User and Security
            AssociateRequest objAssociateRequest = new AssociateRequest();
            // Create related entity reference object for associating relationship
            // In this case we SystemUser entity reference  
            objAssociateRequest.RelatedEntities = new EntityReferenceCollection();
            objAssociateRequest.RelatedEntities.Add(new EntityReference("systemuser", guidSystemUserId));
            // Create new Relationship object for System User & Security Role entity schema and assigning it 
            // to request relationship property
            objAssociateRequest.Relationship = new Relationship("systemuserroles_association");
            // Create target entity reference object for associating relationship
            objAssociateRequest.Target = new EntityReference("role", guidSecurityRoleId);
            // Passing AssosiateRequest object to Crm Service Execute method for assigning Security Role to User
            crmService.Execute(objAssociateRequest);
        }

I am executing above code from my console utility. I see performance degrade when I need to assign multiple security roles to 10k users.

Need you help and guidance to improve my performance of the code.

Thanks,

Bipin