One bug, and performance issues

General information :

Game options

Version : 18w44a

JVM Arguments : -Xmx3G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=16M

*In-game options*

Resolution : 1280×1024
Graphics : Beautiful
Smooth lighting : Maxumum
MipMap levels : 4
Biome Blend : 5×5
Render Distance : 16 Chunk
Unlimited framerate
Clouds : Off
Particles : All

Bug : A complete catalogue advancement get the player that tame a Llama

Performance issue : The game very lagging in the 18w48a snapshot. The game is manually set 3GB RAM [ JVM Argumens ]And the game use 2300Mb RAM. World loading speed and rendering very slow.

See memory usage in the screenshot