diff --git a/common/src/main/java/us/myles/ViaVersion/protocols/protocol1_13to1_12_2/chunks/ChunkSection1_13.java b/common/src/main/java/us/myles/ViaVersion/protocols/protocol1_13to1_12_2/chunks/ChunkSection1_13.java
index 736b6891f..4361e0d70 100644
--- a/common/src/main/java/us/myles/ViaVersion/protocols/protocol1_13to1_12_2/chunks/ChunkSection1_13.java
+++ b/common/src/main/java/us/myles/ViaVersion/protocols/protocol1_13to1_12_2/chunks/ChunkSection1_13.java
@@ -135,7 +135,12 @@ public class ChunkSection1_13 implements ChunkSection {
         }
 
         // Read blocks
-        Long[] blockData = Type.LONG_ARRAY.read(input);
+        // Long[] blockData = Type.LONG_ARRAY.read(input);
+        long[] blockData = new long[Type.VAR_INT.read(input)];
+        for (int i = 0; i < blockData.length; i++) {
+            blockData[i] = input.readLong();
+        }
+
         if (blockData.length > 0) {
             for (int i = 0; i < blocks.length; i++) {
                 int bitIndex = i * bitsPerBlock;
@@ -222,7 +227,7 @@ public class ChunkSection1_13 implements ChunkSection {
             }
         }
         for (long l : data) {
-            Type.LONG.write(output, l);
+            output.writeLong(l);
         }
     }
 
@@ -265,7 +270,7 @@ public class ChunkSection1_13 implements ChunkSection {
             }
         }
         for (long l : data) {
-            Type.LONG.write(output, l);
+            output.writeLong(l);
         }
     }
 
diff --git a/common/src/main/java/us/myles/ViaVersion/protocols/protocol1_13to1_12_2/data/MappingData.java b/common/src/main/java/us/myles/ViaVersion/protocols/protocol1_13to1_12_2/data/MappingData.java
index c51cd40dc..714c0944d 100644
--- a/common/src/main/java/us/myles/ViaVersion/protocols/protocol1_13to1_12_2/data/MappingData.java
+++ b/common/src/main/java/us/myles/ViaVersion/protocols/protocol1_13to1_12_2/data/MappingData.java
@@ -5,6 +5,8 @@ import com.google.common.collect.HashBiMap;
 import com.google.gson.JsonArray;
 import com.google.gson.JsonElement;
 import com.google.gson.JsonObject;
+import io.netty.util.collection.IntObjectHashMap;
+import io.netty.util.collection.IntObjectMap;
 import us.myles.ViaVersion.util.GsonUtil;
 
 import java.io.IOException;
@@ -14,13 +16,13 @@ import java.util.HashMap;
 import java.util.Map;
 
 public class MappingData {
-    public static Map<Integer, Integer> oldToNewBlocks = new HashMap<>();
     public static BiMap<Integer, Integer> oldToNewItems = HashBiMap.create();
     public static Map<String, Integer[]> blockTags = new HashMap<>();
     public static Map<String, Integer[]> itemTags = new HashMap<>();
     public static Map<String, Integer[]> fluidTags = new HashMap<>();
     public static BiMap<Short, String> oldEnchantmentsIds = HashBiMap.create();
     public static Map<Integer, Integer> oldToNewSounds = new HashMap<>();
+    public static BlockMappings blockMappings;
 
     public static void init() {
         JsonObject mapping1_12 = loadData("mapping-1.12.json");
@@ -28,7 +30,13 @@ public class MappingData {
 
         // TODO: Remove how verbose this is
         System.out.println("Loading block mapping...");
-        mapIdentifiers(oldToNewBlocks, mapping1_12.getAsJsonObject("blocks"), mapping1_13.getAsJsonObject("blocks"));
+        try {
+            Class.forName("io.netty.util.collection.IntObjectMap");
+            blockMappings = new BMNettyCollections();
+        } catch (ClassNotFoundException e) {
+            blockMappings = new BMJDKCollections();
+        }
+        blockMappings.init(mapping1_12, mapping1_13);
         System.out.println("Loading item mapping...");
         mapIdentifiers(oldToNewItems, mapping1_12.getAsJsonObject("items"), mapping1_13.getAsJsonObject("items"));
         System.out.println("Loading new tags...");
@@ -115,4 +123,48 @@ public class MappingData {
             }
         }
     }
+
+    public interface BlockMappings {
+        void init(JsonObject mapping1_12, JsonObject mapping1_13);
+        Integer getNewBlock(int old);
+    }
+
+    private static class BMJDKCollections implements BlockMappings {
+        private Map<Integer, Integer> oldToNew = new HashMap<>();
+
+        @Override
+        public void init(JsonObject mapping1_12, JsonObject mapping1_13) {
+            mapIdentifiers(oldToNew, mapping1_12.getAsJsonObject("blocks"), mapping1_13.getAsJsonObject("blocks"));
+        }
+
+        @Override
+        public Integer getNewBlock(int old) {
+            return oldToNew.get(old);
+        }
+    }
+
+    private static class BMNettyCollections implements BlockMappings {
+        private IntObjectMap<Integer> oldToNew = new IntObjectHashMap<>();
+
+        @Override
+        public void init(JsonObject mapping1_12, JsonObject mapping1_13) {
+            mapIdentifiers(oldToNew, mapping1_12.getAsJsonObject("blocks"), mapping1_13.getAsJsonObject("blocks"));
+        }
+
+        @Override
+        public Integer getNewBlock(int old) {
+            return oldToNew.get(old);
+        }
+
+        private static void mapIdentifiers(IntObjectMap<Integer> output, JsonObject oldIdentifiers, JsonObject newIdentifiers) {
+            for (Map.Entry<String, JsonElement> entry : oldIdentifiers.entrySet()) {
+                Map.Entry<String, JsonElement> value = findValue(newIdentifiers, entry.getValue().getAsString());
+                if (value == null) {
+                    System.out.println("No key for " + entry.getValue() + " :( ");
+                    continue;
+                }
+                output.put(Integer.parseInt(entry.getKey()), Integer.parseInt(value.getKey()));
+            }
+        }
+    }
 }
diff --git a/common/src/main/java/us/myles/ViaVersion/protocols/protocol1_13to1_12_2/packets/WorldPackets.java b/common/src/main/java/us/myles/ViaVersion/protocols/protocol1_13to1_12_2/packets/WorldPackets.java
index fcf898dca..788ac54f4 100644
--- a/common/src/main/java/us/myles/ViaVersion/protocols/protocol1_13to1_12_2/packets/WorldPackets.java
+++ b/common/src/main/java/us/myles/ViaVersion/protocols/protocol1_13to1_12_2/packets/WorldPackets.java
@@ -256,11 +256,11 @@ public class WorldPackets {
     }
 
     public static int toNewId(int oldId) {
-        Integer newId = MappingData.oldToNewBlocks.get(oldId);
+        Integer newId = MappingData.blockMappings.getNewBlock(oldId);
         if (newId != null) {
             return newId;
         }
-        newId = MappingData.oldToNewBlocks.get(oldId & ~0xF); // Remove data
+        newId = MappingData.blockMappings.getNewBlock(oldId & ~0xF); // Remove data
         if (newId != null) {
             System.out.println("Missing block " + oldId);
             return newId;
diff --git a/common/src/main/java/us/myles/ViaVersion/protocols/protocol1_9_1_2to1_9_3_4/chunks/ChunkSection1_9_3_4.java b/common/src/main/java/us/myles/ViaVersion/protocols/protocol1_9_1_2to1_9_3_4/chunks/ChunkSection1_9_3_4.java
index 93e5bd0a6..8539f0f14 100644
--- a/common/src/main/java/us/myles/ViaVersion/protocols/protocol1_9_1_2to1_9_3_4/chunks/ChunkSection1_9_3_4.java
+++ b/common/src/main/java/us/myles/ViaVersion/protocols/protocol1_9_1_2to1_9_3_4/chunks/ChunkSection1_9_3_4.java
@@ -153,7 +153,11 @@ public class ChunkSection1_9_3_4 implements ChunkSection {
         }
 
         // Read blocks
-        Long[] blockData = Type.LONG_ARRAY.read(input);
+        //Long[] blockData = Type.LONG_ARRAY.read(input);
+        long[] blockData = new long[Type.VAR_INT.read(input)];
+        for (int i = 0; i < blockData.length; i++) {
+            blockData[i] = input.readLong();
+        }
         if (blockData.length > 0) {
             for (int i = 0; i < blocks.length; i++) {
                 int bitIndex = i * bitsPerBlock;
@@ -245,7 +249,7 @@ public class ChunkSection1_9_3_4 implements ChunkSection {
             }
         }
         for (long l : data) {
-            Type.LONG.write(output, l);
+            output.writeLong(l);
         }
     }
 
@@ -288,7 +292,7 @@ public class ChunkSection1_9_3_4 implements ChunkSection {
             }
         }
         for (long l : data) {
-            Type.LONG.write(output, l);
+            output.writeLong(l);
         }
     }
 
diff --git a/common/src/main/java/us/myles/ViaVersion/protocols/protocol1_9_3to1_9_1_2/chunks/ChunkSection1_9_1_2.java b/common/src/main/java/us/myles/ViaVersion/protocols/protocol1_9_3to1_9_1_2/chunks/ChunkSection1_9_1_2.java
index 03bede471..fff7980bd 100644
--- a/common/src/main/java/us/myles/ViaVersion/protocols/protocol1_9_3to1_9_1_2/chunks/ChunkSection1_9_1_2.java
+++ b/common/src/main/java/us/myles/ViaVersion/protocols/protocol1_9_3to1_9_1_2/chunks/ChunkSection1_9_1_2.java
@@ -145,7 +145,11 @@ public class ChunkSection1_9_1_2 implements ChunkSection {
         }
 
         // Read blocks
-        Long[] blockData = Type.LONG_ARRAY.read(input);
+        // Long[] blockData = Type.LONG_ARRAY.read(input);
+        long[] blockData = new long[Type.VAR_INT.read(input)];
+        for (int i = 0; i < blockData.length; i++) {
+            blockData[i] = input.readLong();
+        }
         if (blockData.length > 0) {
             for (int i = 0; i < blocks.length; i++) {
                 int bitIndex = i * bitsPerBlock;
@@ -237,7 +241,7 @@ public class ChunkSection1_9_1_2 implements ChunkSection {
             }
         }
         for (long l : data) {
-            Type.LONG.write(output, l);
+            output.writeLong(l);
         }
     }
 
@@ -280,7 +284,7 @@ public class ChunkSection1_9_1_2 implements ChunkSection {
             }
         }
         for (long l : data) {
-            Type.LONG.write(output, l);
+            output.writeLong(l);
         }
     }
 
diff --git a/common/src/main/java/us/myles/ViaVersion/protocols/protocol1_9to1_8/chunks/ChunkSection1_9to1_8.java b/common/src/main/java/us/myles/ViaVersion/protocols/protocol1_9to1_8/chunks/ChunkSection1_9to1_8.java
index 77ed52c0a..72a48578e 100644
--- a/common/src/main/java/us/myles/ViaVersion/protocols/protocol1_9to1_8/chunks/ChunkSection1_9to1_8.java
+++ b/common/src/main/java/us/myles/ViaVersion/protocols/protocol1_9to1_8/chunks/ChunkSection1_9to1_8.java
@@ -144,7 +144,7 @@ public class ChunkSection1_9to1_8 implements ChunkSection {
             }
         }
         for (long l : data) {
-            Type.LONG.write(output, l);
+            output.writeLong(l);
         }
     }
 
@@ -187,7 +187,7 @@ public class ChunkSection1_9to1_8 implements ChunkSection {
             }
         }
         for (long l : data) {
-            Type.LONG.write(output, l);
+            output.writeLong(l);
         }
     }
 
diff --git a/pom.xml b/pom.xml
index 8cc37e2db..7b33e133f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -95,10 +95,12 @@
         </dependency>
 
         <!-- Netty (Network Library) -->
+        <!-- You should make this work with 4.0.20.Final -->
+        <!-- Using 4.0.23.Final to use Netty Collections -->
         <dependency>
             <groupId>io.netty</groupId>
             <artifactId>netty-all</artifactId>
-            <version>4.0.20.Final</version>
+            <version>4.0.23.Final</version>
             <scope>provided</scope>
             <optional>true</optional>
         </dependency>