> > > I've heard no argument why the PTC mode should be intrinsically faster than the non-PTC mode > > there's a simple one: Hitting the stack less means you h

> > > I've heard no argument why the PTC mode should be intrinsically faster than the non-PTC mode > > there's a simple one: Hitting the stack less means you hit less memory. > But I explicitly acknowledge this in my comment! Not really sure what your point is. If you agree that's an argument as to why tail-call elimination should be intrinsically faster, I'm not sure why you'd say it isn't. I can't shake this feeling you think you're having a very different argument than I am. > remember that there is so far only 1 major JS implementation that managed to do this without impact. Which for some reason you think means this isn't an implementation issue.