Theoretically, it's just as fast as frame-based exception handling which follows pointers up the stack. However, things that might impact the performance are things like code locality. For example, if the exceptional code hasn't been loaded into memory since it hasn't been needed, your program will need to stall while the code is loaded into memory.

So basically, assume it is fast as hell (zero-cost) until you hit an exceptional case (so don't use exceptions for flow control.) In fact, I no longer use exceptions at all. I just "make a note and move on". Having objects that don't cause catastrophic failures when they are "null" is a good first step.