(Fix in Progress, in beta)
The Minecraft Official Community Realm had a very bad lag and framerate loss, we worked for a few hours after the new 1.9 update VIA (Xbox) to come to a conclusion,
This issue occurred after 1.9 dropped yesterday.
A 13X13 map wall was the culprit after removing them 1 by 1 the issue subsided and lag and framerate loss was gone.
So this is for a report regarding a bug with Maps and that many in a centralized location.
Also : Jukebox may have issues with pickblock and use of it if you get to near it, and may cause crash of players game on xbox.