[h8hawk]

Pypy is basically abandoned project. Main version is Python2 and It has poor support for python 3. The latest version They are supporting is python3.5. Beside that even with Pypy they wouldn't be even close to nodejs. Julia is on par with Fortran or C. Reason behind Julia amazing performance is its type system. e.g multiple dispatch and value types. Python lakes both. Python also has parallelism problem with GIL. Mypy team currently works on compiler based on static type annotation: https://github.com/mypyc/mypyc I think they could gain much more performance than Pypy.

[j88439h84]

This is not correct. Pypy is actively developed.

Numerical code is always written in numpy which can drop the GIL.