NSNotificationCenter vs delegation - which is faster?

Question

I have read a lot about the pros and cons of each , and i know delegates are usually for one listener, and notifications are for many. The question is about performance.

Answer 1

Calling the delegate is just a method invocation but when notifications are used there some more stuff should be done behind the scenes to deliver your notification. Considering this - delegate is a bit faster.

Realtime audio processing is a complex task and I tend to think that delegate's method call or sending a notification produces much more less overhead than your audio-processing code.

UPDATE

Considering performance issues you always should do measurements while trying different approaches.