...
If there is a limitation on the number of connections to the domain controller and an Approval activity is desired in the same workflow as processing a large number of operations, it is recommended to separate edirectory activities within a a different workflow/ snippet separate snippet from the workflow in which where the Approval activity is used (because approval has a default persistence mechanism). In that way, the workflow/ snippet will not have operations/ activities persisted and the workflow will run normally without the persistency flag. Only the workflow with Approval activity will be persisted.
...