diff --git a/anvil-loader/build.gradle b/anvil-loader/build.gradle
index 790d415..2328060 100644
--- a/anvil-loader/build.gradle
+++ b/anvil-loader/build.gradle
@@ -4,4 +4,6 @@ version '1.0-SNAPSHOT'
 dependencies {
     /* Core */
     compile_excludeCopy project(':core')
+
+    compile (group: 'net.sf.trove4j', name: 'trove4j', version: '3.0.3')
 }
\ No newline at end of file
diff --git a/anvil-loader/src/main/java/mc/world/anvil/RegionFile.java b/anvil-loader/src/main/java/mc/world/anvil/RegionFile.java
index e9e8198..a2bd8c7 100644
--- a/anvil-loader/src/main/java/mc/world/anvil/RegionFile.java
+++ b/anvil-loader/src/main/java/mc/world/anvil/RegionFile.java
@@ -2,6 +2,8 @@ package mc.world.anvil;
 
 import com.flowpowered.nbt.Tag;
 import com.flowpowered.nbt.stream.NBTInputStream;
+import gnu.trove.list.TByteList;
+import gnu.trove.list.array.TByteArrayList;
 import lombok.extern.slf4j.Slf4j;
 import mc.core.world.chunk.Chunk;
 
@@ -13,19 +15,22 @@ import java.util.zip.InflaterInputStream;
 
 @Slf4j
 public class RegionFile implements Closeable {
+    private static final byte BYTE_TRUE = 1,
+                              BYTE_FALSE = 0;
+
     private RandomAccessFile file;
-    private List<Boolean> sectorFree; //TODO заменить на Trove TByteList
+    private TByteList sectorFree;
     private final int[] offsets = new int[1024];
 
     public RegionFile(File file) throws IOException {
         this.file = new RandomAccessFile(file, "rw");
 
         int sizeOfSectorFree = (int)this.file.length() / 4096;
-        sectorFree = new ArrayList<>(sizeOfSectorFree);
-        sectorFree.add(false);
-        sectorFree.add(false);
+        sectorFree = new TByteArrayList(sizeOfSectorFree);
+        sectorFree.add(BYTE_FALSE);
+        sectorFree.add(BYTE_FALSE);
         for (int i = 0; i < sizeOfSectorFree-2; i++) {
-            sectorFree.add(true);
+            sectorFree.add(BYTE_TRUE);
         }
 
         for (int i = 0; i < offsets.length; ++i) {
@@ -34,7 +39,7 @@ public class RegionFile implements Closeable {
 
             if (read != 0 && (read >> 8) + (read & 255) <= this.sectorFree.size()) {
                 for (int j = 0; j < (read & 255); ++j) {
-                    this.sectorFree.set((read >> 8) + j, false);
+                    this.sectorFree.set((read >> 8) + j, BYTE_FALSE);
                 }
             }
         }