You are mixing languages with implementations.
If CPython devs would care as much as Common Lisp, Dylan, Scheme, Smalltalk, JavaScript, Julia, it surely wouldn't be as slow.
There are PyPy, TrufflePython and OpenJ9 Python, they all suffer from the stigma of not being CPython.
Side bar, I wasn't aware it was a popular educational tool. I was taught type strong languages, and coming into Python felt like writing pseudocode. Too easy, as the Aussies would say!