When I wrote an Objective-C bridge, I used introspection at class creation time: I overloaded ObjectiveC->`[]() so that when, for example, ObjectiveC.NSObject was accessed, a c-method performed introspection of the NSObject class and created a program dynamically using the C level module API: start_new_program() and friends. Methods were trampolines generated using libffi This provided relatively good runtime speed of method calls (as they were  c methods that used libffi combined with the objective-c API) without the overhead of performing `[] and introspection on each method call. I also built a system of overlays that could provide custom mixing methods for situations where the generic binding wouldn’t suffice. Perhaps something like this could be used to provide optimal performance?

Bill