Poor Performance in DCOM DLL

Hi All,
I am new to DCOM Development. I have created a Com DLL.
Where I have created an interface using IDL. No custom marshalling. I defined Authentication level for this component as null and the identity as interactive user. Updating appropriate settings in the registry I made this as Surrogate DLL. The component is working perfectly. The problem is performance. (If the client user has no password for his NT account trying to access the component in the server where it is (Server NT machine) currently logged in by a user who has password at that time, the component takes time to respond. if both have password or both don't have password that time it works perfectly).

What might be the problem?

Thanks In Advance

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