Hack minecraft to be happy with more tile entities

src/main/java/cam72cam/mod/util/FastContainsList.java

@@ -0,0 +1,144 @@
+package cam72cam.mod.util;
+
+import java.util.*;
+
+public class FastContainsList<T> implements List<T> {
+
+    private List<T> list;
+    private Set<T> set;
+
+    public FastContainsList(List<T> list, Set<T> set) {
+        this.list = list;
+        this.set = set;
+    }
+
+    @Override
+    public int size() {
+        return list.size();
+    }
+
+    @Override
+    public boolean isEmpty() {
+        return list.isEmpty();
+    }
+
+    @Override
+    public boolean contains(Object o) {
+        return set.contains(o);
+    }
+
+    @Override
+    public Iterator<T> iterator() {
+        return list.iterator();
+    }
+
+    @Override
+    public Object[] toArray() {
+        return list.toArray();
+    }
+
+    @Override
+    public <T1> T1[] toArray(T1[] a) {
+        return list.toArray(a);
+    }
+
+    @Override
+    public boolean add(T t) {
+        set.add(t);
+        return list.add(t);
+    }
+
+    @Override
+    public boolean remove(Object o) {
+        set.remove(o);
+        return list.remove(o);
+    }
+
+    @Override
+    public boolean containsAll(Collection<?> c) {
+        return set.containsAll(c);
+    }
+
+    @Override
+    public boolean addAll(Collection<? extends T> c) {
+        set.addAll(c);
+        return list.addAll(c);
+    }
+
+    @Override
+    public boolean addAll(int index, Collection<? extends T> c) {
+        set.addAll(c);
+        return list.addAll(index, c);
+    }
+
+    @Override
+    public boolean removeAll(Collection<?> c) {
+        set.removeAll(c);
+        return list.removeAll(c);
+    }
+
+    @Override
+    public boolean retainAll(Collection<?> c) {
+        set.retainAll(c);
+        return list.retainAll(c);
+    }
+
+    @Override
+    public void clear() {
+        set.clear();
+        list.clear();
+    }
+
+    @Override
+    public T get(int index) {
+        return list.get(index);
+    }
+
+    @Override
+    public T set(int index, T element) {
+        T found = list.set(index, element);
+        if (found != null) {
+            set.remove(found);
+            set.add(element);
+        }
+        return found;
+    }
+
+    @Override
+    public void add(int index, T element) {
+        set.add(element);
+        list.add(index, element);
+    }
+
+    @Override
+    public T remove(int index) {
+        T found = list.remove(index);
+        set.remove(found);
+        return found;
+    }
+
+    @Override
+    public int indexOf(Object o) {
+        return list.indexOf(o);
+    }
+
+    @Override
+    public int lastIndexOf(Object o) {
+        return list.lastIndexOf(o);
+    }
+
+    @Override
+    public ListIterator<T> listIterator() {
+        return list.listIterator();
+    }
+
+    @Override
+    public ListIterator<T> listIterator(int index) {
+        return list.listIterator(index);
+    }
+
+    @Override
+    public List<T> subList(int fromIndex, int toIndex) {
+        return list.subList(fromIndex, toIndex);
+    }
+}

src/main/java/cam72cam/mod/world/World.java

@@ -18,17 +18,16 @@
 import cam72cam.mod.math.Vec3i;
 import cam72cam.mod.util.Facing;
 import cam72cam.mod.serialization.TagCompound;
+import cam72cam.mod.util.FastContainsList;
 import net.minecraft.block.*;
 import net.minecraft.block.state.IBlockState;
 import net.minecraft.entity.EntityLiving;
 import net.minecraft.entity.item.EntityItem;
 import net.minecraft.entity.player.EntityPlayer;
 import net.minecraft.init.Blocks;
-import net.minecraft.util.DamageSource;
 import net.minecraft.util.EnumFacing;
 import net.minecraft.util.EnumParticleTypes;
 import net.minecraft.util.math.AxisAlignedBB;
-import net.minecraft.util.math.BlockPos;
 import net.minecraft.world.EnumSkyBlock;
 import net.minecraft.world.chunk.Chunk;
 import net.minecraftforge.common.IPlantable;
@@ -68,6 +67,11 @@ private World(net.minecraft.world.World world) {
         internal = world;
         isClient = world.isRemote;
         isServer = !world.isRemote;
+        if (isServer) {
+            if (!(world.loadedTileEntityList instanceof FastContainsList)) {
+                world.loadedTileEntityList = new FastContainsList<>(world.loadedTileEntityList, new HashSet<>());
+            }
+        }
     }
 
     /** Helper function to get a world map (client or server) */

src/main/resources/META-INF/UniversalModCore_at.cfg

@@ -1,4 +1,5 @@
 public net.minecraft.client.audio.SoundHandler field_147694_f # sndManager
 public net.minecraft.client.audio.SoundManager field_148629_h # playingSounds
 public net.minecraft.client.resources.FolderResourcePack func_191385_d(Ljava/lang/String;)Ljava/io/File; # getFile
-public net.minecraft.client.Minecraft field_110449_ao # defaultResourcePacks
+public net.minecraft.client.Minecraft field_110449_ao # defaultResourcePacks
+public-f net.minecraft.world.World field_147482_g # loadedTileEntityList