2 ms·
"Just make it faster and everybody will move" is demonstrably false. See PyPy.
"Just make it faster and everybody will move" is demonstrably false. See PyPy.
Of course, "no regressions" is another condition. With PyPy lots of C extensions break.
PyPy is another implementation. Might as well be another planet. Extensions break or are slower. Different toolkits. DB Drivers not working, etc.