Мне лично вот это очень зашло, прям не хватает:
Editor Iteration Profiler (EIP) can help you identify bottlenecks in your code during domain reloads (Enter Playmode, Script Compilation, etc.).
In Unity 2020.2, the application that processes the conversion (il2cpp.exe) takes advantage of modern multi-core processors, dramatically decreasing the overall IL2CPP player build times.
Camera.main used to be a performance costly function to call. With this optimization a dedicated list of objects with the main camera tag is maintained, and searching this list is almost instantaneous.
Nested Prefab loading in the editor has been optimized and sped up by up to 20x.
Regarding script dependencies , Prefabs that contain MonoBehaviours will now be in sync with the script and won't lose references in the case of compile errors.
Scene searching is no longer limited to the open Scene; it's now possible to search through all the Scenes and Prefabs of your project at once.