This may be a pointless and silly question, but
is Delegation faster than Notification (generally) ?
Delegation allows you to check if the client is interested, via
respondsToSelector:. If the delegate does not implement the method
(or there is no delegate), then you may be able to save some work.
There's no equivalent way to tell if any object is listening for a
notification.
Though sometimes whether the object notifies is controllable, as in
[NSView setPostsFrameChangedNotification:]
-Peter
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