idk how long this issue affects pocketmine/nukkit servers but MCPE is quite laggy. (more that in singleplayer) I assume that in PC version it is exactly the opposite of this, so whats wrong? maybe chunk sending? because the lags appear only if you walk and load new chunks. But light is calculated in pocketmine isn't it? so MCPE doesn't have to calculate it, then i really don't know what causes these lags. Moreover in single player MCPE does much more things than in multiplayer (everything which pocketmine does).
Blame mojang for this and not us. They thought that the client is in dire need of spamming servers with MovePlayerPackets... We don't really place a shitstorm of packets on the client.
But these packets are usefull for me, i can Check If player uses some hack that speeds up whole MCPE, because player sends 20 packets per second
I don't feel any sort of lag in single player and on servers. Tho, on my old phone, the frame rate is really bad as compared to MCPE 0.9.0. (after 0.16, the average FPS is around 19-25. Before it was around 30-30+)