Why is it better to use events?

Question

Unity

From books to video tutorials, it is recommended to use events (at least UnityEvents, at least Event of C # itself). The first advantage is clear to me - it reduces the code cohesion in different scripts (classes).
But what is the performance advantage? Aren't events checked every frame? Can anyone explain clearly how they work and how they affect performance?

Answer 1

It is not checked, is it not explained in your books and videos. And why everything that is recommended must be about performance.