The only thing I really don't like about Objective C is that message passing is considerably slower than function calling. You just can not manipulate an image using the `setPixelX:Y:` method in anything close to real time. Using functions in C, this is no problem. So, there you go: Write your algorithms in C, write your program logic in Objective C. Oh, and I love how the OpenGL C API interacts so nicely with Object…
OpenGL is great. Really well designed :)