Use C# Actions Instead Of UnityEvents

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Where it is possible, we should consider using C# delegates instead of UnityEvents for their performance benefit.

Refer to this extensive write-up by Jackson Dunstan.

While the analysis is not quite recent one can probably assume that the C# language feature delegate is better integrated and can also benefit from compiler optimizations.

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Declaring custom Delegates seems to be the classic approach.

The more modern approach is very similar to UnityEvent but with the classic += and -= to assign callbacks. Example:

public event Action<Vector3, Vector3> OnSizeChanged;
// Then in some method:
OnSizeChanged?.Invoke(transform.localScale, transform.position);