Show HN: How I made our whole Python infrastructure 20% faster with 1 change

So they wanted to speed up numpy and machine learning algs and I have no idea how I was going to do it. To cut a long story short, I compiled python 3 for servers with a customized makefile: ``` ./configure --enable-optimizations --with-lto ``` and then, I replaced `-O3` in make file with `-Ofast`. That was it. And of course, I wonder why these are not defaults. --