Arc is a very slow and primitive tool compared to a GC. If you are writing Arc everywhere, you would probably have better performance switching to a JVM language, C#, or Go.
This is incorrect if you are using Rc exclusively for back references. Since the back reference is weak, the reference count is only incremented once when you are creating the datatype. The problem isn't that it's slow, it's that it consumes extra memory for book keeping.
