Last week I went to a very interesting set of presentations of topics related to Unity. One of the topic was given by the creator of one very good library for tween animations LeanTween. I really recommend this library because all the power that can be done with it. And also the most interesting feature of this library is the amazing performance compared to very similar libraries. There are a couple of libraries that do all these kind of effects but this one has a very good performance compared to its competitors. And it is free!