https://mojang.com/2016/04/minecraft-snapshot-16w15a/
While we have started working on it, there won’t be any snapshots for
Minecraft 1.10 for at least another 2-3 weeks. This snapshot is for Minecraft
1.9.x and will eventually lead to a 1.9.3 pre-release.
TL;DR: this snapshot is for 1.9.x and not for 1.10
Notable changes:
Introduces some new bugs
Fixed some existing bugs
Removed the new bugs again
Bugs fixed in 16w15b:
[Bug MC-98822] - Exponential lag because of entities in 1.9
[Bug MC-98994] - Chunk Generation Performance Regressed by 20-30%
[Bug MC-100442] - DEV - Navigation Listener very slow code
[Bug MC-100692] - Collisions cause extreme lag
因1.9实体造成的指数lag
产生区块的效能降低20%~30%
DEV - Navigation Listener让程式码变慢
碰撞造成的极度lag
Bugs fixed in 16w15a:
[Bug MC-94438] - Server: Massive Lag in any versions 15w49a and later
修正15w49a以后的服务器lag