In-process or Out-of-process?

I have a scenario where I would like to know if the code is in AutoCAD's
memory space or not. It's too deep for me to figure out. ;-)

I create in VB an executable called MyApp.exe and a separate DLL called
MyDLL.dll

In MyApp.exe is this code (with the proper references):

Dim objApp As AcadApplication
Dim MyClass As MyDLL.MyClass
Set objApp = CreateObject("AutoCAD.Application")
Set MyClass = objApp.GetInterfaceObject("MyDLL.MyClass")
MyClass.MyFunction

Is MyFunction running at optimum speed in this situation? I'm guessing not.

Is there another, cleaner, way to run functions inside of AutoCAD's
memory space from an external EXE? In my situation, an external EXE is
desired.

Thanks in advance for your help!
-Danny Polkinhorn
WATG
Honolulu