diff --git a/proto_1.12.2/src/main/java/mc/core/network/proto_1_12_2/packets/ChunkDataPacket.java b/proto_1.12.2/src/main/java/mc/core/network/proto_1_12_2/packets/ChunkDataPacket.java
index 2223ad9..0e35b48 100644
--- a/proto_1.12.2/src/main/java/mc/core/network/proto_1_12_2/packets/ChunkDataPacket.java
+++ b/proto_1.12.2/src/main/java/mc/core/network/proto_1_12_2/packets/ChunkDataPacket.java
@@ -9,7 +9,6 @@ import mc.core.network.NetOutputStream;
 import mc.core.network.SCPacket;
 import mc.core.network.proto_1_12_2.ByteArrayOutputNetStream;
 import mc.core.utils.NibbleArray;
-import mc.core.world.Biome;
 import mc.core.world.block.Block;
 import mc.core.world.block.BlockLocation;
 import mc.core.world.block.BlockType;
@@ -180,71 +179,116 @@ public class ChunkDataPacket implements SCPacket {
         /* writeNBT */
     }
 
+    @Override
+    public String toString() {
+        return "ChunkDataPacket{" +
+                "x=" + x +
+                ", z=" + z +
+                ", chunk=" + chunk +
+                '}';
+    }
+
     private class PalettedChunkSection {
         private TIntList palette = new TIntArrayList();
-        private int dataItems = 0;
-        private ByteArrayOutputNetStream dataArray = new ByteArrayOutputNetStream();
+        private byte[] blocks = new byte[4096];
         private NibbleArray blockLight = new NibbleArray();
         private NibbleArray skyLight = new NibbleArray();
 
-        private int idxHalfLong = 0;
+        private int coordsToIndex(BlockLocation location) {
+            return coordsToIndex(location.getX(), location.getY(), location.getZ());
+        }
 
-        private long dataValueCompacted = 0;
+        private int coordsToIndex(int x, int y, int z) {
+            return y << 8 | z << 4 | x;
+        }
 
         private int serializeBlockState(BlockType blockType) {
             return (blockType.getId() << 4) | blockType.getMeta();
         }
 
-        int addBlockType(BlockType blockType) {
+        byte addBlockType(BlockType blockType) {
             int blockState = serializeBlockState(blockType);
 
-            int idx;
-            if (!palette.contains(blockState)) {
+            int idx = palette.indexOf(blockState);
+            if (idx == -1) {
                 palette.add(blockState);
                 idx = palette.size()-1;
-            } else {
-                idx = palette.indexOf(blockState);
             }
 
-            return idx;
+            return (byte) idx;
         }
 
-        void addBlock(Block block) {
-            int idx = addBlockType(block.getBlockType());
-
-            //TODO нужно убрать этот позор
-            // block data
-            if (idxHalfLong == 0) {
-                dataValueCompacted = idx;
-                idxHalfLong++;
-            } else if (idxHalfLong > 0 && idxHalfLong < 15) {
-                dataValueCompacted = (dataValueCompacted << 4) | idx;
-                idxHalfLong++;
-            } else {
-                dataValueCompacted = (dataValueCompacted << 4) | idx;
-                dataArray.writeLong(dataValueCompacted);
-                idxHalfLong = 0;
-                dataItems++;
-            }
-
-            // block light data
-            blockLight.set(block.getLocation().toLocal(), block.getLight());
+        void addBlockLight(int x, int y, int z, int value) {
+            blockLight.set(x, y, z, value);
         }
 
         void addSkyLight(int x, int y, int z, int value) {
-            // sky light data
             skyLight.set(x, y, z, value);
         }
 
+        void addBlock(Block block) {
+            BlockLocation location = block.getLocation().toLocal();
+            blocks[coordsToIndex(location)] = addBlockType(block.getBlockType());
+            addBlockLight(location.getX(), location.getY(), location.getZ(), block.getLight());
+        }
+
         void writeToNetStream(final NetOutputStream netOutputStream) {
+            int bitsPerBlock = 4;
+            if (palette.size() > 15) {
+                if (palette.size() <= 31)
+                    bitsPerBlock = 5;
+                else if (palette.size() > 31 && palette.size() <= 63)
+                    bitsPerBlock = 6;
+                else if (palette.size() > 63 && palette.size() <= 127)
+                    bitsPerBlock = 7;
+                else if (palette.size() > 127 && palette.size() <= 255)
+                    bitsPerBlock = 8;
+            }
+
             //     <Palette>
-            netOutputStream.writeUnsignedByte(4); // Bits Per Block
+            netOutputStream.writeUnsignedByte(bitsPerBlock); // Bits Per Block
             netOutputStream.writeVarInt(palette.size()); // Size of palette
             palette.forEach(value -> { netOutputStream.writeVarInt(value); return true; });  // Palette
             //     </Palette>
             //     <Data Array>
-            netOutputStream.writeVarInt(dataItems); // Size of Data Array
-            netOutputStream.writeBytes(dataArray.toByteArray()); // Data Array
+            final int dataLength = (4096/*16*16*16*/ * bitsPerBlock) / 64;
+            netOutputStream.writeVarInt(dataLength); // Size of Data Array
+            //       <Array>
+            long value = 0;
+            int lastPos = 0;
+            boolean fairy = false;
+            long fairyValue = 0;
+            for (int y = 0; y < 16; y++) {
+                for (int z = 0; z < 16; z++) {
+                    for (int x = 0; x < 16; x++) {
+                        final int blockNumber = (((y << 4) + z) << 4) + x;
+                        final int startLong   = ( blockNumber      * bitsPerBlock    ) / 64;
+                        final int startOffset = ( blockNumber      * bitsPerBlock    ) % 64;
+                        final int endLong     = ((blockNumber + 1) * bitsPerBlock - 1) / 64;
+
+                        final long idxBlockInPalette = blocks[coordsToIndex(x, y, z)];
+
+                        if (startLong != lastPos) {
+                            netOutputStream.writeLong(value);
+                            lastPos = startLong;
+                            if (fairy) {
+                                value = fairyValue;
+                                fairy = false;
+                            } else {
+                                value = 0;
+                            }
+                        }
+                        value |= (idxBlockInPalette << startOffset);
+
+                        if (startLong != endLong) {
+                            fairyValue = idxBlockInPalette >> (64 - startOffset);
+                            fairy = true;
+                        }
+                    }
+                }
+            }
+            netOutputStream.writeLong(value);
+            //       </Array>
             //     </Data Array>
             //     <Block Light>
             netOutputStream.writeBytes(blockLight.getRawData());
@@ -254,13 +298,4 @@ public class ChunkDataPacket implements SCPacket {
             //     </Sky Light>
         }
     }
-
-    @Override
-    public String toString() {
-        return "ChunkDataPacket{" +
-                "x=" + x +
-                ", z=" + z +
-                ", chunk=" + chunk +
-                '}';
-    }
 }