If you want to improve performance of your application then you should
always try to use strict type variables. You can use strict type (or strongly typed) variables by referencing the type library that contains the CoClass. Strict typing uses vtable binding, which is always faster then late binding (or IDispatch binding).

Because the type of the variable is known at compile time, the vtable offset of the CMyObject::Method1() function is determined from the typelib at compile time, and the generated code simply uses the offset to invoke the function. If you don’t use strict type variable then because the type of the objLateBind variable isn