[oblio]

Why?

[GhostVII]

Maybe because python is very slow?

[Myrmornis]

For this to be relevant you'd have to explain that you expect the shell process itself to be doing a lot of CPU-bound work.

[mattgreenrocks]

pypy gives decent speed, and RPython is quite impressive.

But I'm sure it is ease of prototyping and exploring the design space.