We hear you on the list performance. There are significant performance improvements we've made in version 2.0, over the previous version. We’ve also identified more ways to make Pixate faster, especially for CollectionView and TableView, and will roll them out as soon as we can. Performance is our #1 priority, so expect it to continue to improve.
In addition to that, how you use Pixate and what CSS selectors and properties you use can have a big impact on performance, just like with CSS on the web. We’ll be making those kinds of issues clearer for developers through "best practices" posts, as we continue to build our product.