Dude you're nuts. Have you even *looked* at gcc's objective C support and the runtime or are you just pulling this out of your ass? Obj-C messages are highly optimized and incur about 2x-3x the overhead of C function calls.

Objective-C / Cocoa has it's warts, speed is not one of them.

As slow as javascript my ass. I doubt you've ever coded in obj-c. Please study a bit before you spread this kind of FUD.