One could use c++ instead of Python/JS/Go, I would however recommend still using the JSONRpc bridge to communicate. I would not recommend using c/c++ at all, as Atom.io has proven more modern garbage collected languages have become so incredibly fast that c/c++ are primarily distractions unless you are a master of the incredibly huge ecosystem and can sling code together fast without having leaks, pointer issues, and a host of other security issues.

At a minimum, I would recommend using Go or NodeJS with a C binding for any extremely low level operations you would like to achieve, that would make everything much more suitable, you would also benefit of the ecosystem of modules.