It is a perfect example of why you need to know the low level gritty details of how modern CPU’s (and Caches/RAM) works to write high performance high level cod

It is a perfect example of why you need to know the low level gritty details of how modern CPU’s (and Caches/RAM) works to write high performance high level code. A few years ago I optimised a C++ constraint algorithm from 47 minutes to 2 secs by re-arranging how the data access was organised. Writing your code in C++ doesn’t automatically make it fast. You still need to understand the low level details to make fast code.