⟩ Explain me which of the following examples will run faster? 1000 GameObjects, each with a MonoBehaviour implementing the Update callback. One GameObject with one MonoBehaviour with an Array of 1000 classes, each implementing a custom Update() callback.
The correct answer is 2.
The Update callback is called using a C# Reflection, which is significantly slower than calling a function directly. In our example, 1000 GameObjects each with a MonoBehaviour means 1000 Reflection calls per frame.
Creating one MonoBehaviour with one Update, and using this single callback to Update a given number of elements, is a lot faster, due to the direct access to the method.
