only 1x multiplayer, and very very lag and very very slow open minecraft, and (Sering) stopped

Me and my friends cant play minecraft multiplayer 2x in same world
1x play. Have friend open MULTIPLAYER
2x play. Me not found my friend open LAN multiplayer. Pls fix this bug. (Sangat mengganggu)
And... my mobile have small ram.
In minecraft Version 0.10.4 very very fast open world, not need save world slow loading after done play. (semakin maju, semakin lama memuat dunia. Minecraft sekarang sering Terhenti. Itu sangat mengganggu untuk yang ponsel memiliki ram kecil)
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Sorry me have bad english launguage. In "(...)" me use indonesia launguage