It seems likely that we'll want the ability to write fast numeric code in a low-level-ish language. There are a few options: 1. Cython 2. Numba 3. C/C++, wrapped with a variety of other options We should make a decision here before investing serious time in one path or the other. There are, I think, a few categories of concerns: 1. Speed 2. Community adoptability (as a dependency) 3. Barriers to attracting new developers 4. Barriers to maintenance