The First 15 Years of PyPy – A Personal Retrospective
I migrated some internal tools from Lua to Python because of the incredible ecosystem. However, I miss everyday the speed of Lua thanks to LuaJIT. But I already ported almost all critical code to Cython. It is on my todo list to undo this port and test with Pypy.I feel that PyPy need to receive much more love and attention than it actually gets. 
I already donated, and put all my hopes on PyPy. The Windows is also very renegaded, where the multiprocessing module is unusable. I hope to get some time soon to help this incredible project and finish lib_pypy/_winapi.py.