Remove Debug checks as these are super hot and causing noticeable hits
Before: http://i.imgur.com/nQsMzAE.png
After: http://i.imgur.com/nJ46crB.png
Optimize redundant converting of static fields into an unsigned long each call by precomputing it in ctor
== AT ==
public net.minecraft.server.level.ServerChunkCache mainThread
public net.minecraft.server.level.ServerLevel chunkSource
public org.bukkit.craftbukkit.inventory.CraftItemStack handle
public net.minecraft.server.level.ChunkMap getVisibleChunkIfPresent(J)Lnet/minecraft/server/level/ChunkHolder;
public net.minecraft.server.level.ServerChunkCache mainThreadProcessor
public net.minecraft.server.level.ServerChunkCache$MainThreadExecutor
public net.minecraft.world.level.chunk.LevelChunkSection states
