The PS4 and Xbox may have difficulty running resource intensive content like Mutant Survival. We have released updates to improve the performance on consoles. Unfortunately, many of the performance issues are out of our control and depends on the version of the Minecraft running.
We know that Mojang continually updates the clients on consoles to improve performance. Most players don't have these problems - so we don't know why some do. So while it may not work for you today, it may start working noticeably better in an update to Minecraft in the near future.
If the latest updates does not perform to your satisfaction, you can contact Mojang or the app store to request a refund or report the issue.