Well he answered me as if he understood me, so I am going to go ahead with that assumption. This thread is not at all difficult to follow. Anyone who uses rescue should be shot on sight--it takes a masochist to introduce panic as a stack unwind mechanism intended to be caught. The process should stop. I have never seen rescue used in the wild, so it seems as if the only thing this has in common with exceptions is stack unwinding. It is apples and oranges and the performance difference is meaningless unless you try to use them as the same.

To be fair, pcwalton was not advocating this. He was pointing out that defer is already more costly runtime wise than exceptions, correcting another person.