I think his point (on the final slide) is that in Python, writing fast code means not using the high-level language features that make it pleasant to write, whe

I think his point (on the final slide) is that in Python, writing fast code means not using the high-level language features that make it pleasant to write, whereas writing fast code in Haskell (sometimes) means using higher level language features, meaning that it's still pleasant to write. I don't have enough experience in writing highly optimized Python to know whether that's true or not.