Such a misguided article.
What i constantly fight at work is poorly written unmaintainable code.
The code that needs to be fast is 1% or less.
Use three step rule when implementing something:
1. Make it work
2. Make it pretty
3. Make it fast (measure and optimize where it matters)
Second that book! I have read dozens of technical books, but none come close in practical wisdom. If you have been in the industry and worked on large projects you will find it very relevant. I hope it is also as relevant and easy to understand for people who do not have many years of experience already.
You are saying the same exact thing as the comment you replied to. Differences in the force at the feet and head is exactly the gradient of the field. If you have no gradient the forces are equal everywhere.