46 Tips & Tricks for 2D mobile Performance in Unity by Sickle Brick. If this is your first jump into the world of Unity, my first tip (this one’s a freebie) is to stop trying to use it like other languages and environments. You will be using GameObjects, you will be adding multiple script components, and you will have to think differently. When I first started, my approach was to largely ignore prefabs (or use them like Flash’s display list) and get a copy of Box2D running. Painful as it is to deviate, get ready to put in some work! Without further ado, let’s get started: Physics: -Use the built-in physics. It might seem like a waste of cycles to have a fully 3D physics engine running the show for a 2D game, but bear in mind that the Nvidia PhysX engine will be running in Unity’s native core. We’re talking about a hyper-optimised engine maintained by large professional teams, and not a hobbyist 2D engine. Freeze Z position and X/Y rotation for that 2D feel.