Speed Limits

https://travisdowns.github.io/blog/2019/06/11/speed-limits.html

Sometimes you just want to know how fast your code can go, without benchmarking it. Sometimes you have benchmarked it and want to know how close you are to the maximum speed. Often you just need to know what the current limiting factor is, to guide your optimization decisions.

Well this post is about that determining that speed limit1. It’s not a comprehensive performance evaluation methodology, but for many small pieces of code it will work very well.