Sorry you couldn't make it No, I haven't done any performance measurements on any of this code.
Maybe I don't understand the issue, but the OO in NEC paradigm is specifically designed to meet that: you dynamic dispatch in the appropriate error handler on the fly.
Oh - I see where the miscommunication is - yes, I presented on the error core, not error handling. I'd like to limit the conversations in this thread to the core, although we'll need to inevitable discuss handling too, but I'd like that to be in a separate thread (feel free to start one and link to it from here).