PC configurations

Motherboard : B85M Pro4

Processor Intel-I5 4460

Videocard Nvidia GTX 1050 Ti

Memory DDR3 8GB 1600Mhz

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18w45a launcher Options

Resolution : 350 × 350 ( faster loading )

Game directory :  C:/Users\a\AppData\Roaming\.minecraft

Java Executable :  F:\Program Files (x86)\Minecraft\runtime\jre-x64\1.8.0_51\bin\javaw.exe

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

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18w45a In-Game options

(first image)

Current resolution : 1280×1024

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Performance Issues ( slow chunk loading, world genereating/loading and exiting )

40 entities or over it is terribly lagged the game