VC++ 6.0
ATL
PII 300
W2K

I created an Inproc ATL COM server, which contains only one very simple
method. The idl file is copied below. In my test client (a simple dialog
application) I perform the following:

        for (i = 0; i < 100000; i++){
                m_pIScnr->Read(&Value);
        }

using GetTickCount() I determined that this loop takes 12500ms.

I also created a standard DLL, which exported one method with the exact same
signature and implementation. I tested it using a similar loop and
determined that the loop took 30ms.

In the settings for the idl file I have "Stubless Proxies" unchecked.

Can someone please explain why the inproc server call takes so long.

Thank you for your time.

import "oaidl.idl";
import "ocidl.idl";

        [
                object,
                uuid(073DA079-0B5B-4C5A-9A84-005DB23EDB04),

                helpstring("IScnr_ComCallTest Interface"),
                pointer_default(unique)
        ]
        interface IScnr_ComCallTest : IUnknown
        {
                [helpstring("method Read")] HRESULT Read([out] DWORD*
pValue);
        };

[
        uuid(CD7FE741-EA6F-401E-8E5E-1A7FE722EF8B),
        version(1.0),
        helpstring("ComCallTest 1.0 Type Library")
]
library COMCALLTESTLib
{
        importlib("stdole32.tlb");
        importlib("stdole2.tlb");

        [
                uuid(F05F5C15-850E-4BB8-909D-CA39E65C3FB3),
                helpstring("Scnr_ComCallTest Class")
        ]
        coclass Scnr_ComCallTest
        {
                [default] interface IScnr_ComCallTest;
        };
};

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