Hey Gygoracdes and futo333,
Thank you for your feedback. I have seen multiple posts and issues lately about lack of mobile optimization. Though we are neither very close, or very far, from where we would like to be, we are working to fix our performance with mobile devices. As stated by fellow developers on this forum thread: Very Disappointing - Mobile - Unreal Engine Forums, UE4 has grown significantly since it first launched.
Thanks for your patience as we continue to optimize mobile performance!