I realized this hard while optimizing signal processing code, integral over infinite spaces (what great example), it is game over for my level of skills, sadly,

I realized this hard while optimizing signal processing code, integral over infinite spaces (what great example), it is game over for my level of skills, sadly, I was not able to even optimize code correctly without first writing optimized simplest examples possible and showing it to physicist (it is like I understood/felt way to simplify math but have no skill to actually do it), physicists quickly realized how he can rewrite math in more simpler way, the final result was code x30 faster in worst cases.