The one I linked to in my previous post also produces code that's fast enough to use in the critical path in low-latency trading systems.

As you may know, q's "scalar performance" is not great; similar to Scheme or python due to boxing overhead (as you can see in the linked k.h file below).

Also, the fact that q is untyped has a severe impact on its safe use in large and complex projects.

(ETA: https://github.com/Morgan-Stanley/hobbes)