My question is around the optimization techniques that a lot of people apply to React apps. I see very often how devs focus on executing their components only once or twice. What I think matters at the end is if there any changes in the actual DOM tree. If not they in theory should be ok to see your functional components fired many times.

One React mistake that's slowing you down
Improve the Performance of your React Forms
Fix the slow render before you fix the re-render
One simple trick to optimize React re-renders


It's fine to re-render