Earlier quoted context omitted.
Since when is that a bad thing? (And Python really isn't that old.)
For algorithmic trading, speed is life.
I'm a Python2 programmer who is making my "Python3 transition" over to Go. So I don't have much attachment to it, but Python code isn't slow. I'm moving because of the language leadership towards conservatism towards the language which is my philosophy rather than feature-creep and technical churn.
The CPython implementation is, and it's still always been fast enough for everything I've written, so the meme is slightly overblown as far as I'm concerned.