Flutterby™! : Profiling some code that's running on

Profiling some code that's running on Apple AppKit, and I had no idea that [NSString stringWithFormat:...] and NSRect's `-convertRect:fromView:nil` were so expensive. Like *really* expensive.

(and, for the latter with flipped views, sometimes wrong, there are places I'm trying to do my own calculations, but dang!)