Whimsy drove me from productive stuff towards profiling stuff. The maze app (last post) is indeed spending 60-70% of its time on what amounts to a single method call. It's not actually the dynamic invoke on a MethodInfo (like I suspected) but simply creating storage for the return value from a .NET method.

It shouldn't take quite that long, and I suspect that area is rife with shortcuts that could be taken to get Tangent back into the 1 order of magnitude area vs C#. Will research later. Ideally do some more productive work too; bugfixes, example apps...