Animations are added to an Animation Blueprint, where they will be evaluated and played back on the character at runtime. Additional processes, such as animation blends, IK evaluations, physics simulations, and more, will each subtract from your project's performance budget in order to be evaluated. Some processes are simple and don't require much performance budget to evaluate, other processes perform more advanced operations that result in better looking animations, but may require a lot of your performance budget. All animation system features have an associated performance cost.